160607-N-DC740-013 OAK HARBOR, Wash. (June 7, 2016) Mobile Tactical Operations Center Four provides Naval Air Station Whidbey Island with an emergency operations center during Citadel Rumble 2016. Citadel Rumble is an integrated disaster response and recovery exercise for shore-based commands to exercise and validate their emergency management plans. (U.S. Navy photo by Mass Communication Specialist 2nd Class John Hetherington/Released)