"The roar of the helicopters overhead snaps us back into reality. We will never forget the nightmare of that summer..." these were the phrases that started the story of Silver and Brown, two soldiers who were recalled back to the Natorm headquarters in the summer of 1975, during the final months of the Vietnam War, in order to rescue the ex-U.S. army scientist Dr. R. Muckly, who was kidnapped and presumably imprisoned in the interior of Vietnam by North Side terrorists, as part of an organized special forces unit. The team proceeds with the mission by going up to Yan river on a boat in order to deceive enemy guard, but their operations are quickly sighted by the terrorists. As a result, the team abandons the boat and they get across Do Nang city to continue the operation, wondering how their plan was figured out by the enemy and after doing so, the team receives a new strategy plan from the headquarters, informing them to aboard an allied plane in order to invade the enemy airport by parachuting, however, the enemy intercepts them in the air and the soldiers begin defending themselves by shooting at the upcoming enemy planes.