The game starts in January 1967 in Saigon, South Vietnam. A CH-47 Chinook containing Caleb "Cal" Walker ,the game's protagonist, and other G.I.s, lands at Tan Son Nhut Air Base in southern Saigon. Walker, along with his squad mate, Private "Psycho" Kowalski, are chosen by Colonel Salter ,The CO to participate in an air assault on a Viet Cong encampment within Kon Tum province. The Walker and Kowalski are put under the command of Lieutenant O'Brien along with another G.I. nicknamed "Short Timer". As Caleb and his squad proceed through the area, a friendly fire incident, involving flawed mortar coordinates, forces another G.I. named Tomkins, to join the squad. Along with the help of a special operations squad made up of Sergeant Ramirez, "Tick Tock" and "Eyeball", they help the Waler and the others clear out the VC encampment. The encampment is soon after converted to a firebase which serves as a headquarters for Walker and his unit.