Davy Crockett portable nuke.
We made a couple thousand of these in the early 50s.
Upshot-Knothole - Grable 1080p ᴴᴰ BONUS FOOTAGE - The 280mm Nuclear Cannon 5/25/53
This is the first AND last test of the nuclear artillery shell (Labeled 'Grable' for "gun") - the 280mm AFAP (Artillery Fired Atomic Projectile). The shot was an artillery delivered airburst. The shell traveled 11,000 yards before detonation which occurred 86 feet west, 137 feet south, and 24 feet above the designated burst point. The predicted yield was 14 kt. - May 25, 1953 (15 Kilotons) - The Atomic Cannon. Tested in the Nevada Desert. Of the twenty M65s produced, at least seven survive on display, plus the 240mm prototype. Most no longer have their "prime movers".
U.S. Army Artillery Museum, Fort Sill, Oklahoma (This is the original "Atomic Annie" that fired the live nuclear shot. It was restored in 2010 and is now displayed with prime movers replacing those that were lost in an accident when the cannon was retrieved from Germany by the museum in 1964.)
United States Army Ordnance Museum, Aberdeen, Maryland (still has the two large prime movers attached) National Museum of Nuclear Science & History, Albuquerque, New Mexico (has two prime movers)
Freedom Park, Junction City, Kansas, overlooking Fort Riley
Rock Island Arsenal, Memorial Field, Rock Island, Illinois
Virginia War Museum, Newport News, Virginia, 240mm prototype Watervliet Arsenal Museum, Watervliet Arsenal, Watervliet, New York, where they were all manufactured
Yuma Proving Ground, Yuma, Arizona
I've read this this is off limits for now. Perhaps because of the bluff it is on overlooks Ft. Riley.