Under lock and key
John Cooper, 100th Civil Engineer Squadron Lock Shop, and a Ministry of Defence civilian, chisels out part of the door edge, before installing an Assa mortice lock on a conference room door March 14, 2007, in the 95th Reconnaissance Squadron, in Building 707. The lock smiths often have to make minor adjustments to doors and fittings to ensure locks fit properly and are secure. (U.S. Air Force photo by Airman Brad Smith)