The National Defense Service Medal (NDSM) is awarded to anyone who has served on active duty, or as an active reservist, in the United States Armed Forces during any of four specified time periods. Originally, reserve component service during the Korean and Vietnam periods of eligibility, other than those Reserve Component personnel in a full-time status or on active duty greater than 89 days, did not qualify for award of the NDSM. This was changed by Executive Order 13293, signed on 28 March 2003, to include Selected Reserve personnel (i.e. drilling reservists) during all periods of eligibility.