N4257L c/n 4335

The aircraft's last duty station was Homestead AFB in Florida, where Steve Williams photographed it in July 1974 (Steve Williams)	After retirement in 1976 the aircraft was flown to Davis Monthan AFB for storage (Richard Vandervord)	Helena, Montana was home to the aircraft for 36 years before being move to a new home at Castle Air Museum (Nigel Hitchman)
The aircraft pauses at a rest stop during its 1,200 mile roadtrip from Billings, Montana to Castle Air Museum (Ron Vader)	The crew from Worldwide began unloading the disassembled aircraft immediately after arriving at the museum in October 2017 (Tony Rocha)	Assembly was finished in short order and the aircraft was on display during my August 8, 2018 visit to the museum (RM Pettersen)

• Final registration - N4257L
• Delivered to USAF September 1954 as RC-121D 52-3417
• Redesignated EC-121D October 1963
• Redesignated EC-121D/T
• Redesignated EC-121T August 1970 but upper radome not removed
• To USAF Reserves at Homestead AFB, FL June 1974
• Retired and flown to Davis Monthan AFB for storage March 1976
• To Helena Vocational Tech Center, Helena, MT March 1981 as N4257L
• Ferried to Helena, MT early July 1981 with Frank Lang in command
• Used for training at the Helena College of Technology's Department of Aviation Maintenance Technology. Engine run-ups performed regularly until early 1990’s
• School still using aircraft for training until at least the mid 2000's
• Declared excess to school's needs and school looking for a new home for aircraft in November 2008
• Evergreen Air and Space Museum acquired aircraft in May 2009 and plans to make it airworthy and fly it from Helena to McMinnville, Oregon
• Aircraft evaluated in July and cleanup began in September 2009
• Two week inspection in May 2010 revealed aircraft to be in generally good condition
• No further work undertaken between 2010 and 2013
• Evergreen Airlines filed for bankruptcy December 31, 2013, forcing museum to cancel plans to move aircraft
• Acquired by Castle Air Museum January 2014
• Moved to Castle October 2017 and on display April 2018