The M-29 Davy Crocket missile system was a recoilless rifle designed to fire tactical nuclear warheads.
The M-29 Davy Crockett recoilless rifle was created in the 50's for use against the soviets in the event of war breaking out in Germany. The Atomic Battle Group would have men stationed in Europe with an M-29 a few kilometers apart from each other would guard against a soviet invasion that in the end, never came.
The M-29 used the M-338 nuclear round which was a version of the W54 warhead. This M-338 had a damage level equal to 10 to 20 tons of TNT.
The M-29 could be fired from a tripod launcher on either an APC or a jeep. The accuracy of the Davy Crockett was horrible on both of these vehicles to say the least.