This is the Naval Surface Warfere Center. It builds war material, but we are interested in engines. It makes JATOs used as boosters for take off in UAV planes.

"Two 5-inch JATO NSWCs"

-There are various types, the Mk23 and Mk34 stand out from 1,000 lbf to 4,500 lbf of thrust. An example of its use is to assist a target drone to take off in the figure below.

"Launch of a NSWC UAV"