- Final registration - N4257L
- Delivered to USAF September 1954 as RC-121D 52-3417
- Redesignated EC-121D 1962
- Converted to EC-121T but upper radome not removed
- To USAF Reserves at Homestead AFB, FL by July 1974
- Retired and flown to Davis Monthan AFB for storage March 26, 1976
- To Helena Vocational Tech Center, Helena, MT March 1981 as N4257L
- Ferried to Helena, MT June 1981 with Frank Lang in command
- Used for training at the Helena College of Technology's Department of Aviation Maintenance Technology...engines and systems were run in 2002
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