Part of an enormous column of armoured vehicles, M109 Self Propelled Howitzers of the US 1/11th ...

Part of an enormous column of armoured vehicles, M109 Self Propelled Howitzers of the US 1/11th Armoured Cavalry Regiment pause and take up defensive positions during their move along Route 23 towards the staging point for Operation Paddington near Xuyen Moc. The operation, involving the equivalent of nine American, South Vietnamese and Australian battalions, is the largest that has so far been conducted in Phuoc Tuy Province.