HL7 Terminology (THO)
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CodeSystem: US Military Service Period

Official URL: http://terminology.hl7.org/CodeSystem/us-military-service-period Version: 1.0.0
Active as of 2026-05-11 Responsible: Health Level Seven International ​ Realm: United States of America flag Computable Name: USMilitaryServicePeriod

Copyright/Legal: This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license

Defines codes to identify discrete periods of United States military service, used to capture when an individual served in the armed forces.

This Code system is referenced in the definition of the following value sets:

  • This CodeSystem is not used here; it may be used elsewhere (e.g. specifications and/or implementations that use this content)

Last updated: 2026-05-11 00:00:00+0000; Language: en

Profile: Shareable CodeSystem

This case-sensitive code system http://terminology.hl7.org/CodeSystem/us-military-service-period defines the following codes:

CodeDisplayDefinition
post-911 September 2001 or later (Post 9/11) Military service occurring on or after September 2001, encompassing the post-9/11 era.
persian-gulf-war August 1990 through August 2001 (including the Persian Gulf War) Military service occurring between August 1990 and August 2001, encompassing the Persian Gulf War era.
period-1975-1990 June 1975 through July 1990 Military service occurring between June 1975 and July 1990.
vietnam-war August 1964 through May 1975 (including the Vietnam War) Military service occurring between August 1964 and May 1975, encompassing the Vietnam War era.
period-1955-1964 February 1955 through July 1964 Military service occurring between February 1955 and July 1964.
korean-war June 1950 through January 1955 (including the Korean War) Military service occurring between June 1950 and January 1955, encompassing the Korean War era.
period-1947-1950 January 1947 through May 1950 Military service occurring between January 1947 and May 1950.
world-war-ii December 1941 through December 1946 (including World War II) Military service occurring between December 1941 and December 1946, encompassing World War II.
pre-1941 November 1941 or earlier Military service occurring on or before November 1941.

Description of the above table(s).

History

DateActionAuthorCustodianComment
2026-06-13createJessica BotaCGPAdd Code System for US Military Service Period; up-805