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“We really do have a GIF for everything”

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Upshot-Knothole Grable was a nuclear weapons test conducted by the United States as part of Operation Upshot-Knothole. The codename Grable was chosen because the letter Grable is phonetic for G, as in “gun”, since the warhead was a gun-type fission weapon. As a shell, or artillery-fired atomic projectile (AFAP), the device was the first of its kind. The test remains the only nuclear artillery shell ever actually fired in the U.S. nuclear weapons test program.  The M65 Atomic Cannon from which it was fired was often called Atomic Annie.