Senior Airman Marcus Graham and Airman 1st Class Nicholas Bennett, 790th Missile Security Forces Squadron security forces members, keep watch outside a launch facility in the 90th Missile Wing missile complex, June 20, 2017. Security forces provides a haven for the 90th Missile Maintenance Squadron during code change enforcing a safe and secure environment to work in. Code change ensures the safety, security and effectiveness of America’s ICBM arsenal, which is the bedrock of nuclear deterrence. (U.S. Air Force photo by Staff Sgt. Christopher Ruano)