Military Sealift Command ships USNS 2nd LT John P. Bobo and USNS LCPL Roy M. Wheat arrived off the coast of Monrovia, Liberia, in the Gulf of Guinea March 20, to participate in a sea-basing and humanitarian aid distribution exercise in conjunction with U.S. Marines and Africa Partnership Station ships USS Fort McHenry and HSV-2 Swift. Bobo and Wheat are U.S. Navy cargo ships that are part of Maritime Prepositioning Ship Squadron One, or MPSRON One, one of three squadrons that preposition military equipment in strategic locations at-sea for rapid delivery ashore in response to military or humanitarian crises. These squadrons are commanded by a U.S. Navy captain with an embarked military staff, while the ships themselves are crewed by merchant mariners under contract to MSC.