The 791st Missile Security Forces Squadron tactical response force members enter a facility at Minot Air Force Base, N.D., Oct. 14, 2015. Twentieth Air Force implemented a missile field security forces restructure that aims to increase the readiness and lethality of defenders across the Numbered Air Force. The Missile Security Operating Concept was implemented Oct. 6, 2017, significantly changing missile field security operations and addressing areas for improvement in defender culture. (U.S. Air Force photo by Airman 1st Class Sahara L. Fales)