Could very well be the Navy imho, take a look at this clip from the last PR.
In addition to these market-ready applications, API and a major aerospace partner are continuing to pursue a longer-range, but highly important mission-critical undersea application for the U.S. Navy. Together with a major subsidiary of the world’s second largest aerospace & defense company (a Fortune-50 firm), API is in discussions with U.S. Navy R&D activities regarding appropriate programs to develop a prototype Unmanned Underwater Vehicle (UUV) propulsion system using API’s AlumiFuel-water reaction as the source of superheated steam to drive the aerospace firm’s turbines.