John F. Kennedy, Harry Truman, Janis Joplin, Marilyn Monroe, Jimi Hendrix, Jerry Garcia, the USNS Seawolf, Bob Hope, the USNS Thresher, and all of the "casualties" from the Vietnam War are actually frozen at a secret base in Iceland so that if there's ever a nuclear war the US will have a good leader and lots of trained and equipped troops to surprise the enemy with. And the troops will have great entertainment, too.

Don't tell anyone.