the first usaf rc-121c, 1955.
the usaf rc-121d 53-0128 2 f-104 starfighters.
a former ec-121r batcat @ amarc, davis-monthan afb, arizona.
rc-121c
10 produced, initial usaf variant
jc-121c
two converted c-121c , 1 tc-121c avionics testbeds
tc-121c
nine rc-121c modified before 1962 crew trainers
ec-121d
73 produced 1953–55 main usaf variant , 1 converted c-121c, designated rc-121d
ec-121d quick look
one testbed qrc-248 iff transponder interrogator
ec-121h
42 usaf upgrades in 1962, 35 ec-121d , 7 wv-2s transferred navy
ec-121j
two usaf ec-121d modified upgraded electronics
ec-121m rivet top
one ec-121d testbed rivet gym cryptologic linguist electronics suite, designated ec-121k
ec-121q
four ec-121d modified upgraded electronics usaf gold digger missions
ec-121r
30 ec-121k / ec-121p transferred usaf in 1966–1967 , converted batcat sensor signal processor
ec-121s
five converted pennsylvania air national guard usaf c-121 transports
ec-121t
final usaf variant. total of 22 ts converted 15 ec-121d , 7 ec-121h. 1 on display @ peterson air , space museum.
xw2v-1
proposed naval development new features such 4 allison t56-a8 turboprop engines, l-1649a starliner wings , bomarc missiles defense. none built; designated l-084 due large differences predecessors.
^ ec-121t photo. archived 2010-11-28 @ wayback machine. peterson air & space museum foundation. retrieved: 23 december 2010.
^ breffort 2006, p. 174.
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