The answer to these questions is located on this CD-ROM from Tri Tac Games.... One of the original stories to go with 1st edition Morrow Project.
Fringeworthy Classic
The supplemental games "Rogue 417" and "Invasion USA" were possible alternates for the disaster that crushes civilization instead of a nuclear showdown. There also there as Soviets you can reuse in Morrow Project or if you want to game as a team that does actually wake up 5 years after.