Brookings Institution Air Force Gen. James M. Holmes, left, commander of Air Combat Command, speaks with the Brookings Institution’s Michael E. O’Hanlon about the challenges of developing doctrine to fight the multidomain battle, Jan. 25, 2018. DoD photo by Jim Garamone SHARE IMAGE: Download Image: Full Size (1.07 MB) Tags: Army, AIR FORCE Photo By: Jim Garamone VIRIN: 180125-D-FN314-001A.JPG Photo Gallery