From Wiki:
http://en.wikipedia.org/wiki/Red_Dawn At one point the teenagers find a downed
United States Air Force pilot, Lt-Col. Andrew Tanner, and from him they learn about the current state of the war: several key communication centers such as
Washington, D.C.,
Kansas City, and
Omaha, Nebraska were obliterated by
nuclear weapons, America's
Strategic Air Command has been crippled in a surprise attack by undercover
Cuban saboteurs, and the paratroopers the youths have encountered were dropped from fake commercial airliners to seize key positions in preparation for subsequent massive assaults via
Mexico and
Alaska. The Soviets' Cuban and Nicaraguan allies (supported by Russian special forces) invading from Mexico occupied the Great Plains between the Rocky Mountains and the Mississippi River, as far north as a line stretching from Cheyenne through Kansas, with Denver enduring a grueling siege. Meanwhile, 60 Russian divisions crossed the Bering Strait to seize Alaska and much of Canada, intending to link up with their allies in the Great Plains, but a decisive American counterattack near the US-Canada border halted Soviet progress and the lines have stabilized. Since the Soviets need to take America intact, and since the United States is unwilling to cause such damage to its own soil, both sides refrain from further use of nuclear weapons and conventional fighting dominates the war.