Player Embed Code: Download Embed Share Defense Department Expert Discusses Cybersecurity Defense.gov Nov. 17, 2020 | 01:00:34 Katie Arrington, the Defense Department's chief information security officer for the office of the undersecretary of defense for acquisition, joins a panel discussion on cybersecurity maturity model certification compliance at the Hack the Building Control Systems Cyber Conference, Annapolis, Md., Nov. 17, 2020.