Air Force and defense industry representatives involved in the Ground Based Strategic Deterrent program walk through the test cell of the Large Rocket Motor Test Facility J-6 at Arnold Air Force Base, Tenn., April 29, 2021. The J-6 facility currently supports aging and surveillance testing of the Minuteman III Intercontinental Ballistic Missile, slated to be replaced by the GBSD ICBM. (U.S. Air Force photo by Jill Pickett) (This image has been altered by obscuring badges for security purposes.)