Player Embed Code: Download Embed Share Defense Leaders Discuss Cyber Operations at Senate Hearing Defense.gov Sept. 26, 2018 | 55:09 Essye B. Miller, DoD's chief information officer; U.S. Cyber Command Deputy Commander Marine Corps Lt. Gen. Vincent R. Stewart; Army Cyber Command chief Lt. Gen. Stephen G. Fogarty; and Office of the Secretary of Defense Principal Deputy Cyber Advisor Marine Corps Brig. Gen. Dennis A. Crall testify at a Senate Armed Services Committee subcommittee hearing on DoD cyber operational readiness in Washington, Sept. 26, 2018.