U.S. Air Force Tech. Sgts. James Gardner and Justo Scott, 633rd Security Forces Squadron flight chiefs, conduct a building sweep of the Youth Center during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise helped to prepare 633rd Air Base Wing personnel for future exercises and real-world situations. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)

U.S. Air Force Tech. Sgt. Justo Scott, 633rd Security Forces Squadron flight chief, takes aim at a gunman during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise helped to prepare 633rd Air Base Wing personnel for future exercises and potential real-world situations. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)

U.S. Air Force Tech. Sgt. James Gardner, 633rd Security Forces Squadron flight chief, apprehends a gunman during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise helped to prepare 633rd Air Base Wing personnel for future exercises and potential real-world situations. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson)

U.S. Air Force Capt. Adam Morgan, 633rd Security Forces Squadron operations officer, radios in to the command post during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise tested the participants’ ability to address communications, response procedures and command and control between first responders and base command and control. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)

U.S. Air Force Airmen 1st Class Matthew Edquid, 633rd Logistics Readiness Squadron material management apprentice, and Jordan Rushing, a 633rd Civil Engineer Squadron geo-base apprentice, receive medical treatment in an ambulance during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise helped to prepare 633rd Air Base Wing personnel for future exercises and potential real-world situations. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)

Airmen of the 633rd Air Base Wing’s emergency medical team transport a wounded patient during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise evaluated installation response procedures of security forces, fire department and ambulance services, mass notification system capabilities, and command and control processes. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)

U.S. Air Force Staff Sgt. Kelly Eaton, 633rd Security Forces Squadron military working dog trainer, prepares to move an injured individual during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise tested the ability of emergency responders to respond to chemical, biological, radiological and nuclear situations, and engage in an active shooter and/or hostage situation. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)

U.S. Air Force Tech. Sgt. James Gardner, 633rd Security Forces Squadron assistant flight chief, checks on injured Airmen 1st Class Matthew Equid, 633rd Logistics Readiness Squadron material management apprentice, and Mark Reposar, 1st Operations Support Squadron air traffic control apprentice, during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise allowed Langley AFB to test and evaluate first responders faced with multifaceted events affecting the installation. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)

633rd Civil Engineer Squadron firefighters place Airman 1st Class Mark Reposar, 1st Operations Support Squadron air traffic control apprentice, on to a stretcher during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. Langley AFB conducted the full-scale exercise for assigned units and agencies to exercise plans, checklists, and standard operating procedures. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)

U.S. Air Force Senior Airman Ryan Woody, 633rd Civil Engineer Squadron emergency management flight, Staff Sgt. Kyle Rollins, 633rd CES fire emergency services crew chief, and Tech. Sgt. Michael Woodburn, 633rd CES Bio-environmental flight, prepare to determine an unidentified substance during the HAZMAT portion of an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The full-scale exercise prepared 633rd Air Base Wing personnel to respond to chemical, biological, radiological and nuclear situations, and to engage in an active shooter and/or hostage situation. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)

U.S. Air Force Senior Airman Ryan Woody, 633rd Civil Engineer Squadron emergency management flight, uses the Ahura FirstDefender system to test unidentified substances during the HAZMAT portion of an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise helped to prepare 633rd Air Base Wing personnel for future exercises and potential real-world situations. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)

Members of the Fort Eustis military police department search the perimeter during an active shooter exercise on the post Dec. 6. The exercise was held to assess the installation’s first response capabilities during a real-world emergency. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)

Officer Joe Gutierrez, field training officer, rushes to impede an attacker during an active shooter exercise at Fort Eustis Dec. 6. Members of the joint base’s military police department were tested on their response time and rescue capabilities in preparation for actual emergencies. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)

Officer Derrick Lee, traffic accident investigator, searches the crime scene for the attacker and possible victims during an active shooter exercise at Fort Eustis Dec. 6. Members of the joint base’s military police department were examined on their response time and rescue capabilities in preparation for real time emergencies. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)

Tech. Sgt. Amanda Goff (left) and Staff Sgt. Alberto Lloso, 633rd Security Forces Squadron, aid Douglas Siebenschuh, a Mission Installation Contracting Command contract specialist, to the paramedics during an active shooter exercise Dec. 6. The exercise was held to analyze first responders' capabilities in mitigating emergencies and contingencies affecting Fort Eustis. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)

Fort Eustis paramedics help Spc. Justin Cox, a military police officer, into an ambulance during an active shooter exercise Dec. 6. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)