You can keep your pilots alive by copying the file HALLFAME. When
you  have  successfully  completed a mission quit to DOS change to the
F-15 directory and type:

  copy hallfame hallfame.xxx

     If  your  guy  gets  killed  on  the next mission quit to DOS and
resurrect him by changing to the F-15 directory and then typing:

  copy hallfame.xxx hallfame