Navy Adm. William E. Gortney, then-commander of the North American Aerospace Defense Command and U.S. Northern Command, greets Thomas Atkin, acting assistant secretary of defense for homeland defense and global security, during a visit to Colorado Springs, Colo., March 23, 2016. During his June 22 testimony before the House Armed Services Committee, Atkin said the department is making progress in implementing its cyber strategy. DoD photo