That thing was an Army weapon wasn’t it????
I believe that was the intent.
Though it appears that it could be mounted on a PBR.
It was, using the nuclear warhead developed for an early USAF air-to-air missile whose accuracy left a lot to be desired. As more accurate [and lighter!] missiles came along, SOMETHING had to be done with those 1/10th kiloton W54 warheads so presto! along came the M-388 Davy Crockett, the light version which was good for 2000 merters range, the heavy for 4000 meters. This is closer than you want to be to a 20-KT nuke going off
When we saw the test shot film footage showing the launch tripod and crew jeep flipped backwards by the blast shockwave, we came to the conclusion that we'd be using a somewhat larger and heavier vehicle for our purposes. And just in case we needed a backup vehicle for a getaway, a spare that was a whole lot faster.