Produced in 1965, this film shows combat activities associated with Operation Piranha, an exercise carried out against Viet Cong insurgents. Helicopter assault techniques are shown. The Marines decided to launch Operation Piranha against the Batangan Peninsula. The operation was launched on 7 September 1965, the amphibious landing was unopposed, while the landing of the ARVN force received some minor ground fire. On 8 September, Company B 1/7 Marines discovered a VC field hospital in a large cave near the center of the Peninsula. The Marines captured four prisoners, but then came under fire from other VC in the cave. The Marines returned the fire and attempted to convince the VC to surrender. Marine engineers then placed explosives in the cave. After the detonation, the Marines counted 66 VC dead inside. By the conclusion of the operation on 10 September, 178 VC had been killed and 360 enemies and suspected enemies had been captured. Allied losses were two Marines and five South Vietnamese killed. The operation, however, failed to wipe out the 1st VC Regiment. Villagers told the Marines that Vietcong units had been in the area but had left, some less than 24 hours before Operation Piranha had commenced. Intelligence reports later indicated that the 1st VC Regiment began leaving the peninsula on 4 September, coinciding with the increased movement of the amphibious ships at Chu Lai. The Peninsula later became part of the Tactical Area of Responsibility of the Korean 2nd Marine Brigade in 1966 and then the Americal Division, however despite periodic operations the area remained a Vietcong stronghold.