160914-N-CW570-258 SANTA RITA, Guam (Sept. 14, 2016) Engineman 1st Class Francis Paulsen, assigned to Coastal Riverine Squadron (CRS) 2 monitors engine revolutions while underway on a Mark VI Patrol Boat for expeditionary mine counter measures during Valiant Shield 2016 in Santa Rita, Guam. Valiant Shield is a biennial U.S. Air Force, Navy and Marine Corps exercise held in Guam, focusing on real-world proficiency in sustaining joint forces at sea, in the air, on land and in cyberspace. (U.S. Navy Combat Camera photo by Mass Communication Specialist 1st Class Arthurgwain L. Marquez/Released)