Staff Sgt. Blake Middleton, 11th Security Forces Squadron emergency services team member, provides perimeter security during a simulated hostage training scenario on Joint Base Andrews, Md., Nov. 7, 2018. Members from the 11th SFS emergency services team and Prince George’s County Police Department specialized operations division participated in the simulated hostage exercise to gain a better understanding of how each unit handles crisis response. (U.S. Air Force photo by Staff Sgt. Cary Smith)

A gunman uses a hostage to communicate with police during a simulated training scenario on Joint Base Andrews, Md., Nov. 7, 2018. Members of the Prince George’s County Police Department specialized operations division and 11th Security Forces Squadron emergency services team participated in the simulated hostage exercise to gain a better understanding how each unit handles crisis response. (U.S. Air Force photo by Staff Sgt. Cary Smith)

Prince George’s County Police Department specialized operations division members approach a building during a simulated hostage training scenario on Joint Base Andrews, Md., Nov. 7, 2018. The scenario required 11th Security Forces Squadron emergency services team members and PG County police officers to work together to apprehend a gunman and rescue hostages. (U.S. Air Force photo by Staff Sgt. Cary Smith)

11th Security Forces Squadron emergency services team and Prince George’s County Police Department specialized operations division officers provide perimeter security during a simulated hostage training scenario on Joint Base Andrews, Md., Nov. 7, 2018. The training allowed both units to gain a better understanding of how each handles crisis response situations. (U.S. Air Force photo by Staff Sgt. Cary Smith)

Prince George’s County Police Department specialized operations division officers inspect a released hostage during a simulated training scenario on Joint Base Andrews, Md., Nov. 7, 2018. The simulated hostage scenario required PG County police officers and 11th Security Forces Squadron emergency services team members to work together to apprehend a gunman and rescue hostages. (U.S. Air Force photo by Staff Sgt. Cary Smith)