- 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
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