Bill, a young new recruit in the Australian Special Air Service, arrives for his year-long tour of duty in Vietnam. Other members of his section include Harry, the section's Corporal and the oldest and most worldly-wise of the group, along with Bung, Rogers, Dawson and Scott. The close-knit group cope with their circumstances with a mixture of humour, cheek, practical jokes and copious quantities of beer. Harry has an ongoing verbal feud with the squadron cook over the questionable quality of the food. During the first weeks of their stay in Vietnam, their biggest enemies are mud, boredom, tinea and the never-ending torrential rains. However the real war strikes suddenly one night when an enemy mortar barrage hits their camp, causing a number of casualties. The patrols first operation takes place shortly afterwards; a short sharp engagement in the dense jungle, which leaves Scott mortally wounded and one wounded Viet Cong who escapes. This encounter sets the tone for the remainder of their tour. Long, exhausting patrols which are periodically interrupted by short savage encounters with either the enemy, mines or booby-traps.