Naval Aircrewman (Helicopter) 3rd Class (NAC) Josh Rosser, from Helicopter Mine Countermeasures Squadron 15 (HM-15), performs a pre-flight maintenance check on the tail rotors of a MH-53E Sea Dragon. Sea Dragons patrol foreign and domestic waters to locate and destroy sea-based mines that would harm watercraft and map safe sea-lanes of travel. (U.S. Navy photo by Mass Communication Specialist 3rd Class (SW) Betsy Knapper/Released)