Vice Adm. Mateczun is currently the commander, Joint Task Force National Capital Region Medical which completed the largest and most complex Base Realignment and Closure (BRAC) project in the history of DoD and merged the National Naval Medical Center and Walter Reed Army Medical Center into the Walter Reed National Military Medical Center, the nation’s largest military hospital.
Mateczun entered active duty in the U.S. Army and trained in Explosive Ordnance Disposal. He served two tours of duty in the Republic of Vietnam where he was awarded the Bronze Star and honorably discharged as a staff sergeant.
Mateczun has a medical degree from the University of New Mexico, a Master of Public Health degree from the University of California, Berkeley, and a law degree from the Georgetown University Law Center.
Mateczun has several tours with the Marine Corps. He was division psychiatrist, 3rd Marine Division and also served as the assistant division surgeon. He served as the force surgeon, Fleet Marine Forces, Pacific, in Camp H. M. Smith, Hawaii. During Operation Desert Storm, he was assigned to I Marine Expeditionary Force in Saudi Arabia as a consultant on the establishment and operation of combat stress centers.
Mateczun commanded the Naval Hospital Charleston, S.C. where he was selected for promotion to flag rank and assigned to the Navy Bureau of Medicine and Surgery as assistant chief for Health Care Operations. His next flag assignment was as joint staff surgeon and medical advisor to the Chairman of the Joint Chiefs of Staff. He was the United States delegate to the NATO Committee of Chiefs of Medical Services. Present in the Pentagon on 9/11, he subsequently served on the joint staff during Operations Noble Eagle, Enduring Freedom and Iraqi Freedom. His subsequent flag assignments were as chief of staff, Bureau of Medicine and Surgery; commander of Naval Medical Center, San Diego; and, deputy surgeon general of the Navy. He was director of the Military Health System Office of Transformation and served as a member of the congressionally mandated task force on the Future of the Military Health System.
Mateczun's awards include the Defense Distinguished Service Medal, Navy Distinguished Service Medal, Defense Superior Service Medal with Oak Leaf Cluster, Legion of Merit with three Gold Stars, Bronze Star, Defense Meritorious Service Medal, Meritorious Service Medal with Gold Star, Navy and Marine Corps Commendation Medal, Army Commendation Medal, and Navy and Marine Corps Achievement Medal.