Senior Airman Derek Baker uses a hand-held controller to lower the 341st Missile Wing’s 150th Minuteman III solid-propellant replacement booster into launch facility Echo-08 Aug. 18, 2009. Airman Baker is a 341st Missile Maintenance Squadron missile handling team technician. The Propulsion Replacement Program, or PRP, extends the service life of the missile through 2020. The first MMIII replacement booster was delivered in April 2001. (U.S. Air Force photo/Staff Sgt. Eydie Sakura)