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Steven D. Rehn

Chief Technology Officer

U.S. Army Cyber Command

Mr. Steven D. Rehn serves as U.S. Army Cyber Command Chief Technology Officer and Director of the ARCYBER Technical Warfare Center.

Prior to his current assignment, Mr. Rehn was Director (Acting) of the Cyber-Capability Development and Integration Directorate, U.S. Army Cyber Center of Excellence.

He retired from the Army in May 2019 after 30 years of service. He received his commission as a Military Intelligence (MI) Officer after graduating from the Reserve Officer Training Corps program at The Citadel, The Military College of South Carolina, in 1989.

His initial assignments, with the 82nd Airborne Division at Fort Bragg, N.C., included assistant battalion security officer (S2) in the 3rd Battalion, 505th Parachute Infantry Regiment (PIR) during the Persian Gulf War; Collecting and Jamming Platoon Leader, A Company 313th MI Battalion; 82nd Airborne Division Electronic Warfare Officer and Chief, Technical Control and Analysis Element; and battalion security officer (S2) for the 1st Battalion, 504th PIR. He was then assigned to the 501st MI Battalion, 1st Armored Division in Dexheim, Germany, where he served as battalion logistics officer (S4) and assistant battalion operations officer (S3) during OPERATION JOINT ENDEAVOR as part of the Implementation Force (IFOR) in Bosnia and Herzegovina. Upon redeployment to Germany he commanded D Company of the 501st MI Battalion.

In 1999 Mr. Rehn transitioned as a Systems Automation Officer and served as the Information Assurance Network Manager for U.S. Army Training and Doctrine Command (TRADOC). In 2001 he transitioned again, as a Telecommunication System Engineer and served as the Information Management (G6) Operations Officer for First United States Army, modernizing mobilization sites, training and equipping National Guard signal forces for deployment to OPERATION IRAQI FREEDOM and OPERATION ENDURING FREEDOM, and was responsible for communications for Defense Support of Civil Authorities east of the Mississippi. In 2005 he was assigned to the National Security Agency as a System Security Engineer for the Department of Defense Information Security Architecture and served as Division Chief, Security Engineering. He deployed to Iraq as the Deputy, National Capabilities and Requirements Office supporting OPERATION IRAQI FREEDOM. Upon his return he served as Branch Chief for Operational Capabilities (J335) with U.S. Cyber Command. Following graduation from the U.S. Army War College, he served as U.S. Africa Command’s (USAFRICOM) J6 Coalition Division Chief, strengthening relationships with African partners, and then as J6 Enterprise Division Chief, restructuring and rebuilding USAFRICOM’s networks.

In 2014 Mr. Rehn was assigned to the Pentagon with the Office of the Secretary of Defense as the Chief, Cyber and Space Programs within the Office of the Undersecretary of Defense for Acquisition, Logistics and Technology and transitioned to a Cyber Officer. He completed his final uniformed tour as the TRADOC Capability Manager for Cyber responsible for Army capability requirements development and management for Cyberspace Operations, Cyber Situational Understanding and the Persistent Cyber Training Environment for joint forces operating in cyberspace.

He entered federal civilian service in September 2019 as the Deputy Director and Senior Advisor for Cyber and Electronic Warfare for C-CDID.

Mr. Rehn earned a bachelor’s degree in Computer Science from The Citadel, where he graduated as Distinguished Military Graduate in 1989, and a master’s degrees in Systems Management-Information Systems from the Florida Institute of Technology and in Strategic Studies from the U.S. Army War College.

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