Active shooter exercise at Eglin Air Force Base

Senior Airman Bradley Mock watches the hallways as his team prepares to move during an active shooter exercise Wednesday, Feb. 6, 2013, at Eglin Air Force Base, Fla. The Airmen entered the building to apprehend the suspect, assess the wounded and report back information to the emergency responders. (U.S. Air Force photo/Samuel King Jr.)

Active shooter exercise at Eglin Air Force Base

Tech Sgt. Daniel Hurlbert watches the hallways while his team searches a room during an active shooter exercise Wednesday, Feb. 6, 2013, at Eglin Air Force Base, Fla. The Airmen entered the building to apprehend the suspect, assess the wounded and report back information to the emergency responders. Hurlbert is assigned to the 96th Security Forces Squadron. (U.S. Air Force photo/Samuel King Jr.)

Exercise Red Flag 13-2

A B-52 Stratofortress from Barksdale Air Force Base, La., approaches the Nellis flightline for a landing during Red Flag 13-2 Jan. 24, 2013. The Red Flag exercise provides allied air forces the opportunity to train air-to-air combat operations on the Nevada Test and Training Range north of Las Vegas. (U.S. Air Force photo/Caitlin Kenney)

Exercise Red Flag 13-2

An F-15C Eagle from the 65th Aggressor Squadron participates in Exercise Red Flag 13-2 Jan. 24, 2013, at Nellis Air Force Base, Nev. The Aggressors participate in air-to-air tactics to prepare units for real world adversarial scenarios. (U.S. Air Force photo/Caitlin Kenney)

Exercise Red Flag 13-2

Airman 1st Class Daniel Lasal talks to the pilot before he marshals out an F-16 Fighting Falcon during Exercise Red Flag 13-2 Jan. 22, 2013, at Nellis Air Force Base, Nev. The crew chief is responsible for keeping the jets maintenance up to date and ensuring it is ready for every mission. Lasal is a crew chief assigned to the 480th Aircraft Maintenance Unit at Spangdahlem, Air Force Base, Germany, (U.S. Air Force photo/Senior Airman Daniel Hughes)

Exercise Red Flag 13-2

Airman 1st Class Daniel Lasal performs preflight checks on an F-16 Fighting Falcon during Exercise Red Flag 13-2 Jan. 22, 2013, at Nellis Air Force Base, Nev. Lasal watches the engine and talks to the pilot as he puts the engine though its preflight inspection. Lasal is a crew chief assigned to the 480th Aircraft Maintenance Unit at Spangdahlem, Air Force Base, Germany, (U.S. Air Force photo/Senior Airman Daniel Hughes)