Early in 1966 the battalion learnt that it was to serve in Vietnam as one of two infantry battalions in the 1st Australian Task Force (1 ATF). As it was given only three months notice for its deployment, the training schedule prior to embarkation was hectic. 'Range practices began in the dawn hours and often went until 2200 hours. Nights and weekends were spent training in night movement and conducting lectures on Vietnamese customs, history, culture and language'. Each company trained at Gospers, in the Wiangaree State Forest in New South Wales, as well as at Canungra, Queensland. In March 1966 the battalion emplaned at Aero Paddock at Holsworthy and moved to Gospers for its final exercise, which included advances to contact, night movement, and defensive operations. After this C Company would deploy to Vietnam on HMAS Sydney, whilst the remainder of the battalion flew by air.