HL7 Terminology (THO)
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This page is part of the HL7 Terminology (v7.2.0: Release) based on FHIR (HL7® FHIR® Standard) v5.0.0. This is the current published version. For a full list of available versions, see the Directory of published versions

: US Military Service Period

Active as of 2026-05-11

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<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="us-military-service-period"/>
  <meta>
    <lastUpdated value="2026-05-11T00:00:00.000+00:00"/>
    <profile
             value="http://hl7.org/fhir/StructureDefinition/shareablecodesystem"/>
  </meta>
  <language value="en"/>
  <text>
    <status value="generated"/>
    <div xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><p class="res-header-id"><b>Generated Narrative: CodeSystem us-military-service-period</b></p><a name="us-military-service-period"> </a><a name="hcus-military-service-period"> </a><div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Last updated: 2026-05-11 00:00:00+0000; Language: en</p><p style="margin-bottom: 0px">Profile: <a href="http://hl7.org/fhir/R5/shareablecodesystem.html">Shareable CodeSystem</a></p></div><p>This case-sensitive code system <code>http://terminology.hl7.org/CodeSystem/us-military-service-period</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">post-911<a name="us-military-service-period-post-911"> </a></td><td>September 2001 or later (Post 9/11)</td><td>Military service occurring on or after September 2001, encompassing the post-9/11 era.</td></tr><tr><td style="white-space:nowrap">persian-gulf-war<a name="us-military-service-period-persian-gulf-war"> </a></td><td>August 1990 through August 2001 (including the Persian Gulf War)</td><td>Military service occurring between August 1990 and August 2001, encompassing the Persian Gulf War era.</td></tr><tr><td style="white-space:nowrap">period-1975-1990<a name="us-military-service-period-period-1975-1990"> </a></td><td>June 1975 through July 1990</td><td>Military service occurring between June 1975 and July 1990.</td></tr><tr><td style="white-space:nowrap">vietnam-war<a name="us-military-service-period-vietnam-war"> </a></td><td>August 1964 through May 1975 (including the Vietnam War)</td><td>Military service occurring between August 1964 and May 1975, encompassing the Vietnam War era.</td></tr><tr><td style="white-space:nowrap">period-1955-1964<a name="us-military-service-period-period-1955-1964"> </a></td><td>February 1955 through July 1964</td><td>Military service occurring between February 1955 and July 1964.</td></tr><tr><td style="white-space:nowrap">korean-war<a name="us-military-service-period-korean-war"> </a></td><td>June 1950 through January 1955 (including the Korean War)</td><td>Military service occurring between June 1950 and January 1955, encompassing the Korean War era.</td></tr><tr><td style="white-space:nowrap">period-1947-1950<a name="us-military-service-period-period-1947-1950"> </a></td><td>January 1947 through May 1950</td><td>Military service occurring between January 1947 and May 1950.</td></tr><tr><td style="white-space:nowrap">world-war-ii<a name="us-military-service-period-world-war-ii"> </a></td><td>December 1941 through December 1946 (including World War II)</td><td>Military service occurring between December 1941 and December 1946, encompassing World War II.</td></tr><tr><td style="white-space:nowrap">pre-1941<a name="us-military-service-period-pre-1941"> </a></td><td>November 1941 or earlier</td><td>Military service occurring on or before November 1941.</td></tr></table></div>
  </text>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="cgp"/>
  </extension>
  <url
       value="http://terminology.hl7.org/CodeSystem/us-military-service-period"/>
  <version value="1.0.0"/>
  <name value="USMilitaryServicePeriod"/>
  <title value="US Military Service Period"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2026-05-11T00:00:00-04:00"/>
  <publisher value="Health Level Seven International"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="hq@HL7.org"/>
    </telecom>
  </contact>
  <description
               value="Defines codes to identify discrete periods of United States military service, used to capture when an individual served in the armed forces."/>
  <jurisdiction>
    <coding>
      <system value="urn:iso:std:iso:3166"/>
      <code value="US"/>
    </coding>
  </jurisdiction>
  <copyright
             value="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"/>
  <caseSensitive value="true"/>
  <content value="complete"/>
  <count value="9"/>
  <concept>
    <code value="post-911"/>
    <display value="September 2001 or later (Post 9/11)"/>
    <definition
                value="Military service occurring on or after September 2001, encompassing the post-9/11 era."/>
  </concept>
  <concept>
    <code value="persian-gulf-war"/>
    <display
             value="August 1990 through August 2001 (including the Persian Gulf War)"/>
    <definition
                value="Military service occurring between August 1990 and August 2001, encompassing the Persian Gulf War era."/>
  </concept>
  <concept>
    <code value="period-1975-1990"/>
    <display value="June 1975 through July 1990"/>
    <definition
                value="Military service occurring between June 1975 and July 1990."/>
  </concept>
  <concept>
    <code value="vietnam-war"/>
    <display
             value="August 1964 through May 1975 (including the Vietnam War)"/>
    <definition
                value="Military service occurring between August 1964 and May 1975, encompassing the Vietnam War era."/>
  </concept>
  <concept>
    <code value="period-1955-1964"/>
    <display value="February 1955 through July 1964"/>
    <definition
                value="Military service occurring between February 1955 and July 1964."/>
  </concept>
  <concept>
    <code value="korean-war"/>
    <display
             value="June 1950 through January 1955 (including the Korean War)"/>
    <definition
                value="Military service occurring between June 1950 and January 1955, encompassing the Korean War era."/>
  </concept>
  <concept>
    <code value="period-1947-1950"/>
    <display value="January 1947 through May 1950"/>
    <definition
                value="Military service occurring between January 1947 and May 1950."/>
  </concept>
  <concept>
    <code value="world-war-ii"/>
    <display
             value="December 1941 through December 1946 (including World War II)"/>
    <definition
                value="Military service occurring between December 1941 and December 1946, encompassing World War II."/>
  </concept>
  <concept>
    <code value="pre-1941"/>
    <display value="November 1941 or earlier"/>
    <definition
                value="Military service occurring on or before November 1941."/>
  </concept>
</CodeSystem>