Mandatory Credit: Photo by REX/Shutterstock (8659953m) APRA HARBOR, Guam (March 24, 2015) Marines from the 3rd Marine Reconnaissance Battalion prepare to disembark the guided-missile submarine USS Michigan (SSGN-727) during a small boat exercise in Apra Harbor. The Marines, based in Okinawa, Japan, worked with the Navy to practice small boat deployment. US military operations