180918-M-WW557-0092 PACIFIC OCEAN (Sept. 18, 2018) Sailors conduct a helicopter boarding search and seizure simulation aboard the Military Sealift Command aviation logistics support roll-on/roll-off container ship SS Curtiss (T-AVB 4), Sept. 18, 2018, during Valiant Shield 2018. Valiant Shield is a biennial, U.S.-only field training exercise (FTX) with a focus on integration of joint training among U.S. forces in relation to current operational plans. This training enables real-world proficiency in sustaining joint forces through detecting, location, tracking, and engaging units at sea, in the air, on land, and cyberspace in response to a range of mission areas. (U.S. Marine Corps photo by Lance Cpl. Kenny Nunez/Released)