Lt. Col. Justin Tolliver, director of operations, Space Test Branch, Test Division, Arnold Engineering Development Complex, talks about the J-6 Large Rocket Motor Test Facility to an attendee of the AEDC “Hap Arnold Day” 70th Anniversary Celebration Open House, June 26, 2021, at Arnold Air Force Base, Tenn. In the background is the test cell of J-6, used to test solid rocket motors, such as those in the Minuteman III ICBMs. (U.S. Air Force photo by Jill Pickett)