Airmen assigned to the 90th Missile Security Operations Squadron verify the credentials of an individual trying to access an entry control point as a part of exercise Sentinel Rampart 21-05 south of Pine Bluffs, Wyoming, Aug. 31, 2021. Operation Sentinel Rampart 21-05 is an exercise overseen by Air Force Global Strike Command to test the Response Task Force capabilities of the 90th Missile Wing. The RTF exercise lasted two days and included personnel from a variety of units across the installation. (U.S. Air Force photo by Airman 1st Class Charles Munoz)