Crew members aboard USS Ronald Reagan (CVN 76) conduct maintenance on U.S Navy EA-18G Growlers during exercise Valiant Shield 18, Sept. 19, 2018. Valiant Shield is a biennial, U.S. only, field training exercise with a focus on integration of joint training among U.S. forces. GUAM 09.19.2018 Video by Staff Sgt. Emili…