U.S. Marine Corps Lt. Col. Allison Thompson (center left), commanding officer, Marine Heavy Helicopter Squadron 464 (HMH-464), discusses strategies with Marines and U.K. service members of 1419 Flight, 78 Squadron Royal Air Force, during a Tactical Recovery of Aircraft and Personnel (TRAP) mission, undisclosed location, Helmand Province, Afghanistan, September 15, 2011. HMH-464 performs TRAP missions in order to retrieve U.S. and U.K. Armed Forces equipment and conduct investigations in support of International Security Assistance Force..