Navy Developing Land-Based Unmanned Vehicle Testing Sites as Early Design Work Continues April 13, 2021 6:29 PM Medium Displacement Unmanned Surface Vehicle (MDUSV) prototype Sea Hunter pulls into Joint Base Pearl Harbor-Hickam, Hawaii on Oct. 31, 2018. US Navy Photo The Navy is making arrangements for land-based testing of its Medium Unmanned Surface Vessel prototype and eyeing similar plans for its Large USV, as the sea service tries to get Congress on board with its plans to rapidly field unmanned vehicles in all domains to create a hybrid manned-unmanned force. Rear Adm. Casey Moton, the program executive officer for unmanned and small combatants, said today at an event hosted by AUVSI that the Navy and Pentagon already have four medium and large USV prototypes in the water today and will have three more delivered in the next few years.