Naval Air Crewman 3rd Class John Porcuna, assigned to Helicopter Mine Countermeasures Squadron (HM) 15, begins to lower a Mk 104 acoustic mine sweeping device out the back of an MH-53E Sea Dragon helicopter during over-water training. HM-15 is assigned to Commander, Task Force 52, promoting mine countermeasures in the U.S. 5th Fleet area of responsibility. (U.S. Navy photo by Mass Communications Specialist 1st Class Daniel Gay/Released)