The Regulus was the 2nd generation cruise missile operated by the US Navy conceived after the positive evaluation of the Fieseler Fi 103 (V1) and some of its American spin-offs. The basic design was that of a small tailless aircraft powered by the ubiquitous J33. Armed with nuclear warheads, they could be operated from a bunch of cruisers, a few aircraft carriers and five submarines. Their operational service lasted less than a decade, from 1955 to 1964. In the end, they served as a sort of stopgap previous to the Polaris.
The USS Growler (SSG-577) here ready to launch in raison d’être and its Achilles’ heel; its launch could only be performed on the surface. Not a thing of hydrodynamic beauty, the Growler was one of the two Greyback-class diesel electric specially designed to operate the Regulus I. Two converted Gato and Balao-class diesel submarines and the nuclear powered USS Halibut completed the “Regulus I submarine fleet”.
Gladly still with us.
Aviation Rapture 
Tailless?
Yep, sort of; no horizontal tail.