K-1                               Lockheed    1955    possible associated with early Lockheed tanker design (XK-1)

K-4                               J.V.Martin  1922    experimental submarine/destroyer-based flying
                                                      boat

KA-2        Savage                Nor.Am.     1950?   in-flight refuelling A-2 (AJ)

KA-3        Skywarrior            Douglas     1966    air-refuelling tanker A-3 (A3D)

KA-6        Intruder              Grumman     1966    air refuelling tanker A-6 (A2F)

KA-7        Corsair II, SLUF      Vought      1980    cancelled air-refuelling tanker-modified A-7

KB-29       Superfortress         Boeing      1952    air-refuelling B-29

KB-47       Stratojet             Boeing      1955    air-refuelling B-47

KB-50       Superfortress         Boeing      1954    air-refuelling B-50

KC-10       Extender              McDD        1980    air-refuelling tanker civilian DC-10 (A),
                                                      MD-11 (B) - ATCA program

KC-97       Stratotanker          Boeing      1944    air-refuelling C-97 - 1st to use "flying boom" apparatus

KC-124      Globemaster II        Douglas     1951    air-refuelling C-124

KC-130      Hercules              Lockheed    1962    USMC/Army long-range tanker/tactical transport
(GV)                                                  C-130 - redes. USMC GV

KC-135      Stratotanker,         Boeing      1954    air-refuelling tanker civilian 717
            Flying Gas Station, Stratobladder, Tank, GLOB (Ground Loving Old Bastard)

KS-3        Viking                Lockheed    1975    test evaluation S-3

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