Massachusetts Army National Guard Sgt. 1st Class Joshua Bainbridge (left) and an Afghanistan Special Forces commando react to a simulated event during command post exercise Regional Cooperation 18 at Camp Edwards on Joint Base Cape Cod, Massachusetts, Sept. 15, 2018. Regional Cooperation is an annual exercise conducted by multiple national partners focusing on stability operations, border security and control, counter terrorism, counter narcotics, and counter proliferation. (U.S. Central Command Public Affairs photo by Tom Gagnier)