Colonel Sam Trautman visits his old friend and ally John Rambo in Thailand. He explains that he is putting together a mercenary team for a CIA-sponsored mission to supply anti-Soviet fighters in Afghanistan. Despite being shown photos of civilians suffering at the hands of the Soviet military, Rambo refuses to join, as he is tired of fighting. Trautman proceeds anyway and is ambushed by enemy forces near the border, resulting in all of his men being killed. Trautman is captured and sent to a large mountain base to be interrogated by Soviet Colonel Zaysen and his henchman Sergeant Kourov.
Embassy official Robert Griggs informs Rambo of Trautman's capture but refuses to approve a rescue mission for fear of drawing the United States into the war. Aware that Trautman will die otherwise, Rambo gets permission to undertake a solo rescue on the condition that he will be disavowed in the event of capture or death. Rambo immediately flies to Peshawar, Pakistan, where he intends to convince arms dealer Mousa Ghani to bring him to Khost, the town closest to the Soviet base where Trautman is held captive.
The Mujahideen in the village, led by chieftain Masoud, hesitate to help Rambo free Trautman. Meanwhile, a Soviet informant in Ghani's employ informs the Russians, who send two attack helicopters to destroy the village. Though Rambo manages to destroy one of them with a turret, the rebels refuse to aid him any further. Aided only by Mousa and a young boy named Hamid, Rambo attacks the base and inflicts significant damage before being forced to retreat. Hamid, as well as Rambo, are wounded during the battle and Rambo sends him and Mousa away before resuming his infiltration.
Skillfully evading base security, Rambo reaches Trautman just as he is about to be tortured with a flamethrower. He and Trautman rescue several other prisoners and hijack a Hind helicopter to escape the base. The helicopter is damaged during takeoff and quickly crashes, forcing the escapees to flee across the sand on foot. An attack chopper pursues Rambo and Trautman to a nearby cave, where Rambo destroys it with an explosive arrow. A furious Zaysen sends commandos under Kourov to kill them, but they are quickly routed and killed. An injured Kourov attacks Rambo with his bare hands, but is overcome and killed.
As Rambo and Trautman make their way to the Pakistani border, Zaysen and his forces surround them. But before the duo are overwhelmed, Masoud's Mujahideen forces attack the Soviets in a surprise cavalry charge. Despite being wounded, Rambo takes control of a tank and uses it to shoot down Zaysen's chopper. The two collide but only Rambo survives. At the end of the battle, Rambo and Trautman say goodbye to the Mujahideen and leave Afghanistan.
What does Rambo use to destroy the attack helicopter?
An explosive arrow