Colonel David W. Reaney was commissioned a Military Intelligence Officer upon graduation from Officer Candidate School Class 2-74, 19 April 1974. His first duty assignment was as a Training Officer, U.S. Army Security Agency Training Center and School, Fort Devens, Massachusetts.

His subsequent duty assignments include: Company Executive Officer, Company F, U.S. Army Security Agency Training Command, Fort Devens, Massachusetts; Brigade Assistant Logistics Officer, Headquarters, U.S. Army Security Agency Training Command, Fort Devens, Massachusetts; Assistant Intelligence Officer, 1-27th Infantry Battalion, 25th Infantry Division, Schofield Barracks, Hawaii; Adjutant, 1-27th Infantry Battalion, 25th Infantry Division, Schofield Barracks, Hawaii; Operations Officer, 372nd Army Security Agency Company, 25th Infantry Division, Schofield Barracks, Hawaii; Assistant Professor of Military Science, University of South Alabama, Mobile Alabama; Chief, Current Operation, European Command Defense Analysis Center, Stuttgart, Germany; Operations Officer, 751st Military Intelligence Battalion, Camp Humphreys, Korea; Brigade S-3, 704th Military Intelligence Brigade, Fort Meade, Maryland; Chief, Army Technical Control and Analysis Element, 704th Military Intelligence Brigade, Fort Meade, Maryland; Deputy Brigade Commander, 704th Military Intelligence Brigade, Fort Meade, Maryland; Commander, 751st Military Intelligence Battalion, Camp Humphreys, Korea; Director, National Security Agency Fellow, National Security Agency, Fort Meade, Maryland; Deputy Chief, Office of Global Response, National Security Agency, Fort Meade, Maryland; Chief, Analysis and Assessment Group, Information Operations Technology Center, Fort Meade, Maryland.