The only remaining XB-70 Valkyrie sits in the middle of the hanger at National Museum of United States Air Force, Wright - Patterson Air Force Base Dayton, Ohio, USA.
This VC-140B carried Presidents Nixon, Ford, Carter and Reagan a number of times, although it was not the primary presidental aircraft. The National Museum of the United States Air Force.
The McDonnell XF-85 Goblin was an American prototype fighter aircraft conceived during World War II by McDonnell Aircraft. It was intended to be deployed from the bomb bay of the giant Convair B-36 bomber as a parasite fighter. The XF-85's intended role was to defend bombers from hostile interceptors, a need demonstrated during World War II. Two prototypes were constructed before the program was terminated. (wiki)
The NKC-135A on display is one of 14 KC-135As permanently converted for special testing. It was extensively modified by the Air Force weapons Laboratory at Kirtland Air Force Base, N.M., and used in an 11-year experiment to prove a high-energy laser could be operated in an aircraft and employed against airborne targets.