Soldiers during an operation

U.S. Army Sgt. Colin Unverzagt, an explosive ordnance disposal technician, provides security after exiting a CH-47 Chinook helicopter with other Soldiers during an operation in the Khost province of Afghanistan April 23, 2010. The operation is being conducted to reintroduce a coalition presence, facilitate Afghan National Security Forces clearance of the Shembowat Valley and conduct key leader engagements with village elders in the province. The Soldiers are from Charlie Troop, 1st Squadron, 33rd Cavalry Regiment, 3rd Brigade Combat Team, 101st Airborne Division (Air Assault). (DoD photo by Sgt. Jeffrey Alexander, U.S. Army/Released)

Modular Airborne Firefighting System

A C-130 Hercules aircraft equipped with a Modular Airborne Firefighting System (MAFFS) drops water over an area in South Carolina April 28, 2010. The drop is part of annual MAFFS training and certification, which is taking place in Greenville, S.C., from April 26 to April 30. The aircraft is from the 146th Airlift Wing out of Port Hueneme, Calif. (DoD photo by Airman 1st Class Nicholas Carzis, U.S. Air Force/Released)