The only time I saw an operational C-121 in the air. It arrived at Greenham with a considerable delay with an air force band on board, which in spite of being some 24 hours late performed the same day.
Pictured outside the main USAF museum building, Columbine III was US President Dwight D. Eisenhower's personal aircraft from 1954 until leaving office in 1961. Ordered by the US Navy as bu 131650, it left the factory as the sole USAF VC-131E. Continuing non-presidential VIP transport duties after replacement by a new VC-137, the aircraft was retired in 1966 and ferried to Wright-Patterson AFB for the United States Air Force Museum.