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The W54 warhead weighed 51-pounds and had an explosive yield of 0.18 kilotons. The projectile in the picture was 30 inches long, 11 inches in diameter, and weighed 76 pounds. The same warhead was used in so called "backpack" nukes and in the Falcon Air to Air missile.
Gee, that's pretty close to the "Holy Hand Grenade."