A perimeter is set around a British Merlin HC3 helicopter, during a Tactical Recovery of Aircraft and Personnel mission, undisclosed location, Helmand Province, Afghanistan, September 15, 2011. U.S. Marines of Marine Heavy Helicopter Squadron 464, 2D Marine Aircraft Wing (Forward) and Helicopter Support Team, 2D Marine Logistics Group (Forward), were on hand to aid British troops of 1419 Flight, 78 Squadron British Royal Air Force, recover U.K. Armed Forces equipment in support of International Security Assistance Force..