Col. Marcus Jackson, Buckley Garrison commander, speaks about the 20th anniversary of the 9/11 attacks, at Buckley Space Force Base, Colo., Sept. 10, 2021. For the anniversary, the Department of Defense focused on ensuring future generations learn about what transpired on Sept. 11, 2001, and the unity of our Nation as it grieves and heals together. (U.S. Space Force photo by Airman 1st Class Shaun Combs)