Here is a possible concise summary:
The summary is about a movie set in an alternate 1980s where World War III has started and the Soviet Union is invading America. The main characters are a group of teenagers who call themselves the Wolverines and fight against the enemy forces in their hometown of Calumet. They face many dangers and losses, but also receive some help from a US Air Force officer. In the end, only two of them survive and reach a safe zone, while the rest die heroically. The movie ends with a message of hope and patriotism.
Here are the key facts extracted from the text:
1. World War III has commenced and Russia, Cuba and Nicaragua are invading the United States.
2. A group of American teenagers, led by Jed and Matt, escape to the mountains and form a resistance group called Wolverines.
3. The Wolverines use guerrilla tactics to attack and kill the enemy soldiers, while facing losses and betrayals among themselves.
4. The Wolverines are aided by a US Air Force lieutenant colonel, Andrew Tanner, who informs them about the status of the war.
5. Jed and Matt sacrifice themselves in a final attack on the Soviet headquarters, while Danny and Erica escape to a safe haven.
6. The movie ends with a partisan rock that honors the Wolverines and implies that America has won the war.