MGS3 Summary:
The story shifts back in time to 1964, the height of the Cold War. Naked Snake—the man who would later become the legendary mercenary known as Big Boss—heads into Soviet territory to help the scientist Sokolov defect to the West. But the mission ends in failure due to the betrayal of Snake's mentor and mission advisor The Boss, a female soldier known as “the Mother of Special Forces.” The Boss defects to the Soviet Union, taking a miniature nuclear warhead with her as a gift, which her new hosts promptly launch at a Russian research facility. Naked Snake heads once more into the Soviet Union on a mission to kill The Boss... The third MGS game tells the story of men and women who struggle to remain loyal even while their fates are at the mercy of the ever changing political “scene.”

MGS PW Summary:
Stories tell of a legendary solider who once waged war against the world. His name was Naked Snake, a.k.a. Big Boss, and the truth behind this legend will finally be told. The era is the 1970's . Big Boss had stationed his soldiers in Colombia, South America, where he was approached by visitors from Costa Rica, a “nation without a military.” In the shadow of the Cuban Missile Crisis, as Latin America became a key to maintaining the power balance between East and West, Costa Rica had miraculously managed to maintain its peace and neutrality. However, in various regions of the country, a mysterious armed force seemed to be engaging in suspicious activities. Now, to preserve peace in this nation without a military, the soldiers move into action. In time, they would be known as the founders of “Outer Heaven.”