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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{
  "resourceType" : "CodeSystem",
  "id" : "us-military-service-period",
  "meta" : {
    "lastUpdated" : "2026-05-11T00:00:00.000+00:00",
    "profile" : [
      🔗 "http://hl7.org/fhir/StructureDefinition/shareablecodesystem"
    ]
  },
  "language" : "en",
  "text" : {
    "status" : "generated",
    "div" : "<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>"
  },
  "extension" : [
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode" : "cgp"
    }
  ],
  "url" : "http://terminology.hl7.org/CodeSystem/us-military-service-period",
  "version" : "1.0.0",
  "name" : "USMilitaryServicePeriod",
  "title" : "US Military Service Period",
  "status" : "active",
  "experimental" : false,
  "date" : "2026-05-11T00:00:00-04:00",
  "publisher" : "Health Level Seven International",
  "contact" : [
    {
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://hl7.org"
        },
        {
          "system" : "email",
          "value" : "hq@HL7.org"
        }
      ]
    }
  ],
  "description" : "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" : "urn:iso:std:iso:3166",
          "code" : "US"
        }
      ]
    }
  ],
  "copyright" : "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" : true,
  "content" : "complete",
  "count" : 9,
  "concept" : [
    {
      "code" : "post-911",
      "display" : "September 2001 or later (Post 9/11)",
      "definition" : "Military service occurring on or after September 2001, encompassing the post-9/11 era."
    },
    {
      "code" : "persian-gulf-war",
      "display" : "August 1990 through August 2001 (including the Persian Gulf War)",
      "definition" : "Military service occurring between August 1990 and August 2001, encompassing the Persian Gulf War era."
    },
    {
      "code" : "period-1975-1990",
      "display" : "June 1975 through July 1990",
      "definition" : "Military service occurring between June 1975 and July 1990."
    },
    {
      "code" : "vietnam-war",
      "display" : "August 1964 through May 1975 (including the Vietnam War)",
      "definition" : "Military service occurring between August 1964 and May 1975, encompassing the Vietnam War era."
    },
    {
      "code" : "period-1955-1964",
      "display" : "February 1955 through July 1964",
      "definition" : "Military service occurring between February 1955 and July 1964."
    },
    {
      "code" : "korean-war",
      "display" : "June 1950 through January 1955 (including the Korean War)",
      "definition" : "Military service occurring between June 1950 and January 1955, encompassing the Korean War era."
    },
    {
      "code" : "period-1947-1950",
      "display" : "January 1947 through May 1950",
      "definition" : "Military service occurring between January 1947 and May 1950."
    },
    {
      "code" : "world-war-ii",
      "display" : "December 1941 through December 1946 (including World War II)",
      "definition" : "Military service occurring between December 1941 and December 1946, encompassing World War II."
    },
    {
      "code" : "pre-1941",
      "display" : "November 1941 or earlier",
      "definition" : "Military service occurring on or before November 1941."
    }
  ]
}