 Other units included the 1st Armoured Personnel Carrier Squadron operating M113 armoured personnel carriers (APCs); 1st Field Regiment, Royal Australian Artillery, consisting of the New Zealand 161st Battery, two Australian batteries equipped with eighteen 105 mm L5 Pack Howitzers, and six 155 mm M109 self-propelled howitzers from the US A Battery, 2nd Battalion, 35th Artillery Regiment; 3rd SAS Squadron; 1st Field Squadron and 21st Engineer Support Troop; 103rd Signals Squadron; 161st Reconnaissance Flight operating Cessna 180s and Bell H-13 Sioux light observation helicopters; and an intelligence detachment.Support was provided by the 1st Australian Logistic Support Group (1 ALSG) at Vũng Tàu, and eight UH-1B Iroquois helicopters from No.9 Squadron RAAF.