Constant vigilance

Staff Sgt. Limuel Beltran, 451st Expeditionary Support Squadron response force assistant flight chief, visits the D-1 post during shift at Kandahar Airfield, Afghanistan, Nov. 5, 2016. Response force members man both static and mobile posts around the airfield to maintain 360-degree security. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Senior Airman Tyler Phillips, 451st Expeditionary Support Squadron response force member, monitors his team’s security sector at Kandahar Airfield, Afghanistan Nov. 5, 2016. Phillips is a Chicago native based out of McConnell Air Force Base, Kansas. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Senior Airman Tyler Phillips, 451st Expeditionary Support Squadron response force member, takes a break during his 12-hour shift maintaining flightline security at Kandahar Airfield, Afghanistan Nov. 5, 2016. Response force members man both static and mobile posts around the airfield to maintain 360-degree security. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Security forces team members from the 451st Expeditionary Support Squadron look out through the window of a mine-resistant, ambush-protected all-terrain vehicle at Kandahar Airfield, Afghanistan Nov. 5, 2016. While on their twelve-hour shifts, response force members maintain their positions in the M-ATV to keep watch over their sector of security. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

An M-4 Carbine rifle and grenade launcher sits beside the seat of the truck commander in a mine-resistant, ambush-protected all-terrain vehicle at Kandahar Airfield, Afghanistan Nov. 5, 2016. Security forces members of the 451st ESS provide airfield security at Kandahar and work with joint and coalition partners to maintain perimeter security at the forward operating base. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Senior Airman James Curry, 451st Expeditionary Support Squadron response force member, uses binoculars to monitor his team’s security sector at Kandahar Airfield, Afghanistan Nov. 5, 2016. Response force teams are posted around the airfield at Kandahar to ensure 365-degree security. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Senior Airman Tyler Phillips, 451st Expeditionary Support Squadron response force member, monitors a Common Remotely Operated Weapon System II in mine-resistant, ambush-protected all-terrain vehicle at Kandahar Airfield, Afghanistan Nov. 5, 2016. The CROWS system is required to be monitored at all times during each 12-hour shift. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)

Senior Airmen James Curry and Tyler Phillips, 451st Expeditionary Support Squadron response force members, man their positions while standing guard at Kandahar Airfield, Afghanistan Nov. 5, 2016. Security forces members of the 451st ESS provide airfield security at Kandahar. (U.S. Air Force photo by Staff Sgt. Katherine Spessa)