In our collection you will encounter military terminology and acronyms. Here you can find out what they mean:
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- (S)
- Denotes an Officer who is qualified in both Visual Signalling and Wireless Telegraphy Duties. In a ship, an Officer qualified as above who is performing either or both these duties. (Source: Australian Navy List, 1941)
- (SM)
- Denotes a Senior Master. (Source: Australian Navy List, 1941)
- S
- Secretariat (United Nations Organisation - UNO)
- S
- Somalia clasp to Australian Service Medal (ASM)
- S
- Senior or Staff
- S
- Supply and Secretariat Branch (Naval)
- S & T
- Supply and Transport (Army)
- S A
- School of Artillery
- S Ad O
- Station Administrative Officer (Air Force)
- S Am
- South America
- S Aust
- South Australia
- S Cd CO
- Senior Commissioned Communication Officer (Naval)
- S of D
- Superintendent of Design
- S of MI
- School of Military Intelligence
- S of S
- Secretary of State (US)
- S Off
- Section Officer (WAAAF)
- S Sjt
- Staff Serjeant
- S Stafford
- South Staffordshire Regiment
- S Supt
- Senior Superintendent
- S/N
- Staff Nurse
- S/Sgt
- Staff Sergeant (a senior sergeant)
- S/Smith
- Shoeing Smith
- SA
- Small arms
- SA
- South Africa
- SA
- South Australia
- SAA
- Small Arms Ammunition
- SAAB
- Scientific Advisor to the Air Board
- SAAF
- South African Air Force
- SAARF
- Special Allied Airborne Reconnaissance Force
- SABC
- Siege Battery Ammunition Column
- SAC
- School of Army Cooperation (RAAF)
- SAC
- Service Aircrew Camp (RAAF)
- SAC
- Strategic Air Command (USA)
- SACA
- Supreme Allied Commander Atlantic
- SACC
- Supporting Arms Coordination Centre
- SACEUR
- Supreme Allied Commander, Europe (North Atlantic Treaty Organisation - NATO)
- SACLANT
- Supreme Allied Commander, Atlantic (North Atlantic Treaty Organisation - NATO)
- SACO
- School Army/Air Cooperation
- SACO
- Sino American Cooperative Organisation (USA)
- SACSEA
- Supreme Allied Commander South East Asia
- SADF
- South African Defence Forces
- SADMINSO
- Senior Administrative Staff Officer
- SAE
- Service Assisted Evacuation
- SAF
- Small Arms Factory
- SAF
- Singapore Armed Forces (Peacekeeping)
- SAFEO
- Safety equipment Officer
- SAIF
- Small Independent Action Force
- Sal
- Salvage
- SAL
- Salvation Army
- SALT
- Strategic Arms Limitation Treaty/Talks
- Salv Offr Aust Corps
- Salvage Officer, Australian Corps [First World War AIF Salvage Unit]
- SAM
- Surface to air missile(s)
- SAMB
- Scientific Adviser to the Military
- San
- Sanitation
- SAN
- School of Air Navigation (RAAF)
- SAN Sect
- Sanitation Section
- Sandra
- Beacon guiding system, RAAF (Second World War)
- SANS
- South African Naval Service
- SAO
- Scientific Advisor's Office
- SAO
- Senior Administrative Officer
- Sap
- A covered trench or tunnel dug to a point near or within an enemy position
- SAP
- Secure Australia Project
- SAR
- Search and Rescue
- SAR
- Semi‑automatic rifle (USA)
- SARO
- Search and Rescue Officer
- SAS
- Small Arms School
- SAS
- Special Air Service
- SAS
- Special Army Service
- SASO
- Senior Air Staff Officer
- SASR
- Special Air Service Regiment
- SASS
- Superintendent Army Scientific Services
- SB
- Siege Battery
- SB
- Stretcher bearer
- Sb
- Switchboard (USA)
- SBA
- Sick Bay Attendant
- SBD
- Scout Bomber Douglas
- SBG
- Small Box Girder
- SBLT
- Sub Lieutenant
- SBMO
- Senior British Medical Officer
- SBNO
- Senior British Naval Officer
- SBR
- Small Box Respirator (First World War)
- SBS
- Special Boat Squadron
- SBS
- Special Boat School (Second World War)
- SBS
- Special Broadcasting Unit
- SBS
- Special Boat Section
- SC
- Security Council (United Nations Organisation - UNO)
- SC
- Staff Captain
- SC
- Staff College
- SC
- Star of Courage
- SC
- Submarine Chaser
- SCA
- Support Command Australia (Navy)
- SCAJAP
- Supreme Command Allied Forces in Japan
- SCAP
- Supreme Commander for the Allied Powers
- SCAT
- South Pacific Combat Air Transport (USA)
- SCD
- Strategic Command Division (East Timor)
- SCM
- Special Courts martial (USA)
- SCNO
- Senior Canadian Naval Officer
- SCO
- Stock Control Officer
- SCU
- Statistical Control Unit
- SCUBA
- Self Contained Underwater Breathing Apparatus
- SD
- Special Duty (USA)
- SD
- Staff Duties
- SD
- Store/Supply Depot
- SD
- Service Dress
- SD
- Special Duties Branch (Air Force)
- SDA
- Seventh Day Adventist
- SDBP
- Seaward Defence Boat
- SDC
- Signal Distribution Centre
- SDEV
- Standard Deviation
- SDI
- Strategic Defence Initiative
- SDIA
- Select Documents on International Affairs
- SDL
- Special Duties List
- SDO
- Senior Dental Officer (First World War)
- SDP
- Supply Dropping Point
- SDR
- Special Despatch Rider
- SDS
- Signals Despatch Service
- SDSC
- Strategic and Defence Studies Centre
- SDSLO
- Services and Defence Science Liaison Officer
- SDSS
- Standard Distribution and Supply System
- SDU
- Survey and design Unit (RAAF)
- SE
- Safety Equipment
- SEA
- South East Asia
- Sea Bees
- Construction Battalions, United States Navy
- Sea Check
- An Examination conducted by a Senior Officer’s staff to discover if a ship or a debt within a ship meets the required standards
- SEA LORDS
- ‘South East Asia Lake, Ocean, River, Delta Strategy’ – United States Navy task force in Mekong Delta
- SEAC
- South East Asia Command
- SEADRAGON
- Operation – Surface ship operations against Vietnam
- Seaforth
- The Seaforth Highlanders (Ross‑shore Buffs, the Duke of Albany's)
- SEALS
- Sea Air and Land (team United States Navy)
- SEAMILS
- SEATO (South East Asia Treaty Organisation) Military Intelligence and Logistic Forms
- SEAP
- SEATO (South East Asia Treaty Organisation) Publications
- SEASS
- South East Asia Signal School
- SEASTAG
- SEATO (South East Asia Treaty Organisation) Standardisation Agreement
- SEATO
- South East Asia Treaty Organisation
- Sec
- Section
- Sec
- Secretary
- Sec
- Secretariat
- Sec
- Second
- Sec
- Secondary
- SEC Dept of ARMY
- Secretary to the Department of the Army
- SECAIR
- Security Department of Air
- SECDEF
- Secretary Department of Defence
- SECMA
- Study and Evaluation of Counter Mine Activities
- SECNAVY
- Secretary Department of the Navy
- SECO
- South Eastern Command in England
- SECT
- Section
- Sect Off
- Section Officer (WRAAF - Women's Royal Australian Air Force)
- SED
- Single entitlement Document (unit equipment list)
- Sen Chap C of E HQ AIF
- Senior Chaplain (Church of England), Headquarters AIF, London [First World War AIF Chaplains Unit]
- Sen Chap Meth HQ AIF
- Senior Chaplain (Methodist), Headquarters AIF, London [First World War AIF Chaplains Unit]
- Sen Chap OPD HQ AIF
- Senior Chaplain (Other Protestant Denominations), Headquarters AIF, London [First World War AIF Chaplains Unit]
- Sen Chap Pres HQ AIF
- Senior Chaplain, ANZAC Mounted Division [First World War AIF Chaplains Unit]
- Sen Chap Pres HQ AIF
- Senior Chaplain (Presbyterian), Headquarters AIF, London [First World War AIF Chaplains Unit]
- Sen Str
- Senior Sister (Air Force)
- SENGSO
- Senior Engineering Staff Officer
- Senior Sailor
- A Petty Officer or Chief Petty Officer
- SEOEM
- Senior Executive Officer (Senior Engineering Staff Officer/Senior Maintenance Staff Officer)
- SEOL
- Senior Executive Officer (Legal)
- SEOLEG
- Senior Executive Officer (Legislation)
- SER
- Serial
- SERN
- Service number
- SES
- Surface effect ship(s)
- SESO
- Senior Equipment Officer
- SEW
- Safety Equipment Worker
- SEWLROM
- Special End of War Leave for regular Officers and men
- SF
- Special Forces
- SF
- Steam gunboat
- SF
- Survey Flight (RAAF)
- SF
- SEATO (South East Asia Treaty Organisation) Force
- SFCP
- Shore Fire Control Party
- SFCS
- Shore Fire Control Spotting
- SFF
- SEATO (South East Asia Treaty Organisation) Field Forces
- SFFS
- SEATO (South East Asia Treaty Organisation) Field Force
- SFI
- Special Flying Instruction
- SFIC
- Seventh Fleet Intelligence Centre
- SFM
- Sergeant Farrier Major
- SFTS
- Service Flying Training School (RAAF)
- SG
- Scots Guards
- Sg C
- Surgeon Captain (Naval)
- SGCE
- Services General Certificate of Education
- SGF
- Southern Group of Forces (Soviet)
- SGPOs
- Second Generation Peace Operations (Peacekeeping)
- Sgt
- Sergeant
- SGU
- Security Guards Unit (RAAF)
- SGUARD
- Security Guard
- SHAEF
- Supreme Headquarters Allied Expeditionary Force
- SHAND
- Stores Hand
- SHD
- Shore Defence
- SHELREP
- Shelling Report
- SHF
- Super High Frequency
- SHFDF
- Super High Frequency Direction Finding
- SHPWRT
- Shipwright/carpenter (Royal Australian Navy)
- SHQ
- Station Headquarters
- Shwt Lt
- Shipwright Lieutenant (Naval)
- SI
- Senior Instructor
- SI
- Seriously Ill
- SIAF
- Small Independent Action Forces
- SIB
- Special Investigation Branch
- SIF
- Selective Identification Feature
- Sig
- Signaler (after rank)
- Sig
- Signalman
- SIG
- Signalman
- Sig C
- Signal Corps (USA)
- Sig C
- Signal Corps/Company
- Sig Coy
- Signal Company
- Sig Sect AETD
- Signal Section, Australian Engineer Training Depot (First World War)
- Sig Sect AETD
- Signal Section, Australian Engineer Training Depot [First World War AIF Signals Unit]
- Sig Sqn
- Signal Squadron
- Sig Tng Unit
- Signal Training Unit [First World War AIF Signals Unit]
- Sig Tp
- Signals Troop
- Sig Tp NZMR Bde
- Signal Troop, New Zealand Engineers (also known as Signal Troop, New Zealand Mounted Rifles Brigade) [First World War New Zearland Unit]
- Sig Trp Eng
- Signal Troop Engineers
- Sig Wire
- Signal Wire used in laying communication signal lines
- Sig(s)
- Signal(s)
- SIGCEN
- Signal Centre
- SIGINT
- Signals Intelligence
- SIGINT
- Signals intelligence
- SIGSOP
- Signals Operator
- SIM
- Simulate
- Sin
- Sinai clasp to Australian Service Medal (ASM)
- SINC
- Staff In Confidence
- SIO
- Senior Intelligence Officer
- SIO
- Supervising Intelligence Officer
- SIOO
- Senior Inspecting Ordinance Officer
- SIT
- Situate
- SITREP
- Situation Report
- SITSUM
- Situation Summary
- SIW
- Self inflicted wound (First World War)
- Sjt
- Sergeant
- SL
- Searchlight
- SL
- Squadron Leader
- SL
- School of Languages
- SL
- Start Line
- SL
- Support Line (USA)
- SLA
- Supply Loading Airfield
- SLAR
- Side looking airborne radar
- SLBM
- Submarine launched ballistic missile(s)
- SLCM
- Sea launched cruise missile(s)
- SLEP
- Service life extension program
- Slg Mn
- Signal Man
- SLICK
- UH-1 utility helicopter used primarily for carrying troops, equipment or supplies. This term is used to distinguish these aircraft from UH-1 gun ships.
- SLO
- Senior Liaison Officer
- SLOC
- Sea Lines of Communication
- SLP
- Supply Landing Point
- SLU
- Special Liaison Unit
- SLVL
- Sea Level
- SM
- Secret Message
- SM
- Sergeant Major
- SM
- Soldier's Medal (USA)
- SM
- Survey Motor Launch
- SMAINTSO
- Senior Maintenance Staff Officer
- SMC
- Staff Message Control
- SME
- School of Military Engineering
- SMET
- Ship’s medical emergency team
- SMF
- Special Mobile Force
- SMG
- Submachine gun (USA)
- SMLE
- Short Magazine Lee Enfield
- SMN
- Seaman
- SMO
- Senior Medical Officer (First World War)
- SMO Aust Base Dep Fr
- Senior Medical Officer, Australian Base Depots, France [First World War AIF Medical Unit]
- SMO Moascar
- Senior Medical Officer, Moascar (also known as SMO, Australian & New Zealand Training Cadre & Details Camp) [First World War AIF Medical Unit]
- SMO No 1 Command Dep
- Senior Medical Officer, No 1 Command Depot [First World War AIF Medical Unit]
- SMO No 4 Command Dep
- Senior Medical Officer, No 4 Command Depot [First World War AIF Medical Unit]
- SMO O Tng Bde
- Senior Medical Officer, Overseas Training Brigade [First World War AIF Medical Unit]
- SMPO
- SEATO (South East Asia Treaty Organisation) Military Planning Office
- SMS
- Seiner Majestat Schiff (eg SMS "Emden")
- SMSP
- SEATO (South East Asia Treaty Organisation) Military Security Publications
- SMTO
- Senior Mechanical Transport Officer (First World War)
- SMTO
- Senior Movements and Transport Officer
- SMTO 1st ANZAC Corps
- Senior Mechanical Transport Officer, 1st ANZAC Corps (Senior Mechanical Transport Officer, Australian Corps) [First World War AIF Supplies and Transport AASC Unit]
- SMTO 2nd ANZAC Corps
- Senior Mechanical Transport Officer, 2nd ANZAC Corps [First World War AIF Supplies and Transport AASC Unit]
- SMTO Aust Corps
- Senior Mechanical Transport Officer, Australian Corps [First World War AIF Supplies and Transport, Australian Army Services Corps Unit]
- SN
- Stores Naval
- SNATCH
- An operation rapidly planned and executed to exploit information obtained from a prisoner of war, Hoi Chanh, or detainee concerning the location of Viet Cong or Viet Cong Infrastructure. Enemy personnel apprehended as a result of information obtained from
- SNCO
- Senior Non Commissioned Officer
- SNI
- Senior Naval Instructor
- SNLR
- Services no longer required
- SNO
- Senior Naval Officer (Transport)
- SNO
- Senior National Officer
- SNOE
- Senior Naval Officers Embarked in Merchant Ships
- SNOL
- Senior Naval Officer Landing
- SNSO
- Superintendig Naval Stores Officer
- SO
- Senior Officer
- SO
- Signals Officer
- SO
- Special Orders (USA)
- SO
- Staff Officer
- SO
- Standing Orders
- SO (NCS)
- Senior Officer (Naval Control Service)
- SO (O)
- Senior Officer (Operations)
- SO ADS AIF Dep in UK
- Staff Officer, Australian Dental Services, AIF Depots in United Kingdom [First World War AIF Medical Unit]
- SO ADS Egypt
- Staff Officer, Australian Dental Services, Egypt [First World War AIF Medical Unit]
- SO ADS Fr
- Staff Officer, Australian Dental Services, France [First World War AIF Medical Unit]
- SO in C
- Signal Officer in Chief
- SO Sigs
- Staff Officer Signals
- SOA
- Special Operations Australia
- SOA
- Speed of Advance
- SOA
- Staff Officer Air Plans
- SOA
- Spectrometric Oil Analysis Programme
- SOACCT
- Staff Officer Accountant
- SOAD
- Staff Officer Air Defence
- SOADMIN
- Staff Officer Administrative Services
- SOADS
- Staff Officer, Australian Dental Service (First World War)
- SOAG
- Senior Officer Assault Group
- SOAL
- Spectrometric Oil Analysis Laboratory
- SOAOC
- Staff Officer to AOC
- SOARM
- Staff Officer Armament
- SOAS
- Spectrometric Oil Analysis System
- SOAT
- Staff Officer Air Training
- SOC
- Scout Observation Curtis
- SOC
- Struck Off Strength (RAAF)
- SOCAI
- Staff Officer Catering
- SOCAS
- Staff Officer to the Chief of the Air Staff
- SODCAS
- Staff Officer to the deputy chief of the air staff
- SODS
- Staff Officer Dental Service
- SOE
- Special Operations Executive (Special Forces) (British forces, Second World War)
- SOEDS
- Staff Officer Education Services
- SOENG
- Staff Officer Engineering
- SOENGS
- Staff Officer Engineering Services
- SOFS
- Staff Officer Fire Service
- SOG
- Small Operational Group
- SOGD
- Staff Officer Ground Defence
- SOGT
- Staff Officer Ground Training
- SOI
- Signal Operation Instructions (USA)
- SOI&RS
- Staff Officer Invalided and Returned Soldiers
- SOINTELL
- Staff Officer Intelligence
- SOK
- Supply authorised (USA)
- SOLOG
- Standards Operational and Logistical
- SOLS
- Staff Officer Legal Service
- SOM
- Senior Official Meetings
- Som LI
- The Somerset Light Infantry (Prince Albert's)
- SOMAINTS
- Staff Officer Maintenance Service
- SOME
- Senior Ordnance Mechanical Engineer
- SOMP
- Staff Officer Maintenance Planning
- SOMS
- Staff Officer Medical Services
- SOOPS
- Staff Officer Operations
- SOORG
- Staff Officer Organisation
- SOP
- Standing Operating Procedure (USA)
- SOP
- Standard Operating Procedure
- SOPA
- Senior Officer Present Alfoat
- SOPAC
- South Pacific Area
- SOPSYCHS
- Staff Officer Psychological Services
- SORA
- Staff Officer Royal Artillery
- SORADA
- Staff Officer Radio Air
- SORE
- Staff Officer Royal Engineers
- SOREC
- Staff Officer Recruiting
- SORO
- Staff Officer repair and overhaul
- SORS
- Staff Officer Strike and Reconnaissance
- Sortie
- The flight of one aircraft from takeoff to touchdown
- SOS
- Struck off strength
- SOS
- A wireless code signal indicative of distress
- SOS
- Service of Supplies
- SOS
- Staff Officer Supplies
- SOTELENG
- Staff Officer Telecommunications Engineering
- SOTP
- Staff Officer Training Policy
- SOTSA
- Staff Officer Technical Spares Assessing
- Sound Powered Telephone
- A Communications system which operates independently of an external power source
- Sov
- Soviet
- SOW
- Status of Women (United Nations Organisation - UNO)
- SOWEAPENG
- Staff Officer Weapons Engineering
- SOWKS
- Staff Officer Works
- SP
- Selection of personnel
- SP
- Self‑propelled
- SP
- Senior Psychologist (Admiralty)
- SP
- Service Police
- SP
- Starting Point
- Sp
- Spain
- Sp
- Service Police
- Sp
- Special Branch (Naval)
- Sp
- Special Duties Officer (RAF)
- Sp Bn ABN
- Support Battalion Airborne Brigade (USA)
- Sp Coy
- Support Company (Vietnam)
- SPAR
- Special Agent Report
- Spars
- Women's Reserve of the United States Coast Guard (name taken from motto)
- SPE
- Service Protected Evacuation
- SPEC
- Specify
- Spec Serv
- Special Service
- Sponson
- Projecting gun platform (RAAF Second World War)
- SPORE
- Singapore
- Spr
- Sapper
- Spt
- support
- SPTF
- Sea Plane Training Flight
- SPTS
- Sea Plane Training Squadron
- SPU
- Service Police Unit (RAAF)
- SPWRT
- Shipwright/carpenter (Royal Australian Navy)
- SQMS
- Staff Quartermaster‑Sergeant
- Sqn
- Squadron
- Sqn Ldr
- Squadron Leader
- Sqn Off
- Squadron Officer (WRAAF - Women's Royal Australian Air Force)
- Sqn QMS
- Squadron Quartermaster Sergeant
- SR
- Sound Ranging (USA)
- SR
- Supplementary Reserve
- SRA
- Surgeon Rear Admiral
- SRAM
- Short range attack missile(s)
- SRBM
- Short range ballistic missile(s)
- SRC
- Scientific Research Committee
- SRD
- Services Reconnaissance Department. Cover name for Special Operations Australia. Allied Intelligence Bureau Second World War Supply Reserve Depot.
- SRECON
- Strike Reconnaissance
- SRG
- Sound Ranging
- SRH
- Supply Railhead
- SRP
- Supply Refilling Point
- SRT
- Short Range Transport
- SS
- Submarine (Ship Prefix)
- SS
- Steamship
- SS
- Schutz Staffel (Guard Detachment/Protection Squad – German, Second World War)
- SS
- Selective Service (USA)
- SS
- Signals school (RAAF)
- SS
- Staff School
- SS
- Stores Section (Vietnam War)
- SS Corporal
- Shoeing Smith Corporal
- SS SGT
- Saddler Sergeant
- SS(C/I)
- Submarine(s) (coastal/inshore)
- SSAFA
- Soldiers, Sailors and Airmen’s Families Association (British)
- SSAHA
- Sailors, Soldiers and Airmen Home Association
- SSB
- Ballistic missile submarine(s)
- SSB
- Single Side Band
- SSB
- Costal Submarine
- SSB
- Short Service Commission
- SSBM
- Nuclear fuelled ballistic missile submarine(s)
- SSD
- Special Sea Duty men – Duty positions for specialised personnel when coming alongside, sailing, or in confined waters
- SSE
- Shape the Strategic Environment
- SSFB
- Standing Sea Fire Brigade
- SSG
- Guided Missile Submarine
- SSGN
- SSN (nuclear fuelled submarines) with dedicated non ballistic missile launchers
- SSI
- Standing Signals Instructions
- SSK
- Anti Submarine Submarine
- SSM
- Squadron Sergeant Major
- SSM
- Staff Sergeant Major
- SSM
- Surface to surface missile(s)
- SSN
- Nuclear fuelled submarine(s)
- SSO
- Senior Supply Officer (First World War)
- SSO
- Special Service Officer (RAF)
- SSO
- Staff Signals Officer (Naval)
- SSO
- Ships Standing Orders
- SSO 2nd Aust Div
- Senior Supply Officer, 2nd Australian Division [First World War AIF Supplies and Transport AASC Unit]
- SSO 5th Aust Div
- Senior Supply Officer, 5th Australian Division [First World War AIF Supplies and Transport AASC Unit]
- SSO Aust Mtd Div
- Senior Supply Officer, Australian Mounted Division [First World War AIF Supplies and Transport AASC Unit]
- SSO NZ & Aust Div
- Senior Supply Officer, New Zealand and Australian Division [First World War AIF Supplies and Transport AASC Unit]
- SSQ
- Station Sick Quarters
- SSR
- Radar Picquet Submarine
- SST
- Submarine Sound Signaling Apparatus
- SSUS
- hipping and Stores Unit (RAAF)
- SSZ
- Specified Strike Zone. Specific unpopulated areas of heavy jungle or swampland which could be cleared for firing for a certain period if US military ground clearance had been obtained.
- ST, S&T
- Supplies and transport
- STA
- Septic traumatic abrasions (First World War)
- Sta
- Station
- STABLEDOOR
- Operation – Defense of South Vietnam ports against underwater attacks
- Stalag
- Stammlager (German) - Prisoner of war camp for other ranks
- STANAG
- Standardisation Agreement NATO
- STAR
- Specialised Training and Reassignment (USA)
- STAR
- Specialised Training and Reassignment (USA)
- START
- Strategic Arms Reduction Talks
- START
- Strategic Arms Reduction Talks
- STD
- Steward (after rank)
- STD
- Standard
- STF
- Special Transport Flight (RAAF)
- Stf
- Staff (USA)
- STI
- Special Technical Instruction
- STM
- Storeman
- STM
- Statute Mile
- Stmn Tech Ord
- Storeman, Technician, Orderly (Peacekeeping)
- Stn
- Station
- STO
- Sea Transport Officer
- STOL
- short take off and landing
- STOVL
- Short take off, vertical landing
- STPT
- Strategic Transport (Aircraft)
- STR
- Strength
- Stra Tr
- Strategical Reconnaissance
- STRAT
- Strategic
- STS
- Sea Transport Staff
- STT
- School of Technical Training (RAAF)
- STU
- School of technical training (RAAF)
- STU
- A form of Asdic, a particular kind of hydrophone
- STUFF
- Ships taken up from trade
- Sturm Abteilung
- Storm troops, brown shirts
- STWD
- Steward
- SU
- Signals Unit (RAAF)
- SU
- Stores Unit (RAAF)
- Sub
- Sub Lieutenant (Naval)
- SUB
- Submarine
- Sub lieutenant (D)
- Sub lieutenant (dental)
- SUBJ
- Subject
- Subm
- Submarine (USA)
- SUBOR
- Subordinate
- SUBSCR
- Subscribe
- SUBT
- Substitute
- SUBT
- Substantive
- Suffolk
- The Suffolk Regiment
- SUGW
- Surface to underwater guided weapon(s)
- SUM
- Surface to Underwater Missile
- Sup
- Supply/Supplies
- Sup O
- Supply Officer
- Sup Pl
- Supply Platoon (Vietnam War)
- SUPDEP
- Department of Supply
- SUPDEP
- Supply Department
- Superhook
- CH-54 cargo helicopter. Also known as Skycrane.
- SUPINTREP
- Supplementary Intelligence Report
- SUPP
- Supply Point
- Supt
- Superintendent
- SUR
- Sydney University Regiment
- SURFIN
- Surface Finisher
- Surreys
- The East Surrey Regiment
- Surv
- Survey (USA)
- Surv
- Survival
- SURVL
- Surveillance
- SV
- Stores Vittling
- SvC
- Service Command (USA)
- SVETS
- Services Vocational and Educational Training Scheme
- SVN
- South Vietnam
- SVN DET
- South Vietnam Detachment
- SVR
- Service
- Svy
- Survey
- SW
- Secretary of War (USA)
- SW
- Shrapnel Wound
- Sw
- Sweden
- SWB
- The South Wales Borderers
- SWB
- Short Wheelbase
- Swbd
- Switchboard
- Switz
- Switzerland
- SWP
- South West Pacific
- SWP(A)
- South West Pacific Area
- SWPA
- South West Pacific Area
- SWR
- Senior WRAN (Women's Royal Australian Navy)
- SWRIGHT
- Shipwright
- SWS
- Shore Wireless Service, RAN
- SWT
- School of Water Transport (Second World War)
- Sy
- Security (after rank)
- SY
- Singals Yeoman. The senior visual communications sailor on board.
- SYNC
- Synchronize
- SYS
- System