The Atomic Cannon (Upshot-Knothole Grable) 15 kt

The M65 Atomic Cannon, often called Atomic Annie, was a towed artillery piece built by the United States and capable of firing a nuclear device. It was developed in the early 1950s and fielded by 1953 in the European and Korean theaters. It was tested on the 25 may, 1953, as a part of operation Upshot Knothole, codenamed Grable (for Gun) pics of it here ~meiii3/pix/