150416-N-IC565-020 PACIFIC OCEAN (April 16, 2015) Pilots, assigned to the Helicopter Sea Combat Squadron (HSC) 21“Blackjacks,” operate an MH-60S Sea Hawk helicopter during a strait transit exercise with Essex Amphibious Group. Essex is underway participating in a certification exercise with the Essex Amphibious Group, which is comprised of Amphibious Squadron THREE and 15th MEU. (U.S. Navy Photo by Mass Communication Specialist 3rd Class Bradley J. Gee/Released)