U.S. soldiers set up a three-deep barrier of concertina wire around their training area during Patriot Shock, an interoperability deployment readiness exercise in Skwierzyna, Poland, Jan. 13, 2016. The soldiers are assigned to the 5th Battalion, 7th Air Defense Artillery Brigade, and worked together with Polish and Swedish forces to validate the unit’s readiness and rapid deployment capabilities using M901 Patriot Launching Stations. U.S. Army photo by Sgt. Paige Behringer