I always assumed firing one of these things was a suicide mission, but some NATO guy on Quora has suggested otherwise, and it seems pretty convincing.

https://www.quora.com/Would-the-Davy-Crockett-tactical-nucle...

Basically, even though the W54 had a max yield of a 1kt, the Davy Crockett used a warhead with a far lower yield, as low as 10 tons