 This resulted in an expansion of artillery regiments by the addition of a third field battery.1st Field Regiment's order of battle for deployment to Vietnam was 101st Field Battery, 105th Field Battery, 161st Battery, Royal New Zealand Artillery and Headquarters Battery.1 RAR deployed to Vietnam in May 1965 with fire support initially provided by 161 RNZA; however, in September 1965 the 105th Field Battery arrived to provide additional fire support.