Infantry timelines · Infantry numbers 1–200

5th Infantry Regiment

A century of division assignments

1916–2026 · Regimental service, battle groups, battalions and deployments.

5th Infantry Regiment unit graphic
5th Infantry Regiment
First division shown17th Division (World War I)27 Jul 1918
Separate battalion histories2 documented elementsDated lineages and service notes below
Page cutoff8 September 2026Last-documented status is explicitly marked

One regiment, separate assignments

The common row follows the regiment. After its reorganization, battle groups and battalions could hold different assignments at the same time. A deployment or temporary attachment does not by itself change the assigned division. The common row closes on 1 Aug 1957; later service belongs to the separate element rows. Battalion rows follow headquarters lineages, often descended from lettered companies, rather than assuming that the old regimental battalions continued unchanged.

Division patches

9th Infantry Division5th Infantry Division71st Infantry Division8th Infantry Division1st Infantry Division25th Infantry Division2d Infantry Division11th Airborne Division1st Armored Division

Representative division patches. Patterns could change over time; an image does not imply that the exact version was worn throughout every period. Divisions without a verified asset remain identified by name.

The dated record

Division timeline

Battalion overview →

Deployments, operations and credited campaign service appear inside assignment cards. Award years establish credited service, not exact tour dates. Some service notes identify only company-sized elements. This is a sourced selection, not a complete movement log.

Assignment ends are exclusive: the next period starts on that date. *Striped final bars mean last documented, with later status unverified through the page cutoff. Unknown intervals are not treated as inactive.

  1. 1 Jan 1916 – 27 Jul 1918

    5th Infantry Regiment

    Assignment not established

    The available record does not establish a precise assignment throughout this interval. No division is inferred.

    Source

  2. 27 Jul 1918 – 10 Feb 1919

    5th Infantry Regiment

    17th Division (World War I)

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  3. 10 Feb 1919 – 24 Mar 1923

    5th Infantry Regiment

    No assigned division

    The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.

    Source

  4. 24 Mar 1923 – 15 Aug 1927

    5th Infantry Regiment

    9th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  5. 15 Aug 1927 – 1 Oct 1933

    5th Infantry Regiment

    5th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  6. 1 Oct 1933 – 15 Jul 1940

    5th Infantry Regiment

    9th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  7. 15 Jul 1940 – 10 Jul 1943

    5th Infantry Regiment

    No assigned division

    The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.

    Source

  8. 10 Jul 1943 – 1 May 1946

    5th Infantry Regiment

    71st Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

    Deployments & overseas operations

    1. 1945

      Rhineland and Central Europe

      5th Infantry Regiment · Campaign service

      Campaign participation is recorded in the Army lineage. The year label summarizes campaign service, not an exact overseas tour.

      Source
  9. 1 May 1946 – 15 Nov 1946

    5th Infantry Regiment

    No assigned division

    The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.

    Source

  10. 15 Nov 1946 – 1 Jan 1949

    5th Infantry Regiment

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  11. 1 Jan 1949 – 10 Oct 1954

    5th Infantry Regiment

    No assigned division

    The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.

    Source

    Deployments & overseas operations

    1. 1950-1953

      Korea

      5th Infantry Regiment · Deployment / overseas operation

      The separate 5th Regimental Combat Team fought in Korea. Temporary combat attachments did not make it an organic divisional regiment.

      Source
  12. 10 Oct 1954 – 25 Aug 1956

    5th Infantry Regiment

    71st Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  13. 25 Aug 1956 – 1 Sep 1956

    5th Infantry Regiment

    No assigned division

    The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.

    Source

  14. 1 Sep 1956 – 1 Aug 1957

    5th Infantry Regiment

    8th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  15. 1 Aug 1957 – 1 Feb 1959

    1st Battle Group / Battalion lineage

    8th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  16. 1 Feb 1959 – 1 Feb 1963

    1st Battle Group / Battalion lineage

    1st Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  17. 1 Feb 1963 – 16 Jan 1986

    1st Battle Group / Battalion lineage

    25th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

    Deployments & overseas operations

    1. 1966-1970

      Vietnam

      1st Battle Group / Battalion lineage · Credited overseas service

      The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates.

      Source
  18. 16 Jan 1986 – 16 Apr 1987

    1st Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  19. 16 Apr 1987 – 16 Aug 1995

    1st Battle Group / Battalion lineage

    2d Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  20. 16 Aug 1995 – 1 Jun 2006

    1st Battle Group / Battalion lineage

    25th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

    Deployments & overseas operations

    1. 2005

      Nineveh Province, Iraq

      1st Battle Group / Battalion lineage · Credited overseas service

      The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates.

      Source
  21. 1 Jun 2006 – 16 Dec 2006

    1st Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  22. 16 Dec 2006 – 6 Jun 2022

    1st Battle Group / Battalion lineage

    25th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

    Deployments & overseas operations

    1. 2008-2009

      Iraq

      1st Battle Group / Battalion lineage · Credited overseas service

      The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates.

      Source
  23. 6 Jun 2022 – page cutoff*

    1st Battle Group / Battalion lineage

    Last documented: 11th Airborne Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage. The source establishes this last recorded status, not uninterrupted service through 2026. The striped bar extends to the page cutoff to keep the later research gap visible.

    Source

  24. 1 Aug 1957 – 1 Dec 1957

    2d Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  25. 1 Dec 1957 – 31 Jan 1962

    2d Battle Group / Battalion lineage

    9th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  26. 31 Jan 1962 – 6 Dec 1969

    2d Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  27. 6 Dec 1969 – 5 Jun 1972

    2d Battle Group / Battalion lineage

    25th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

  28. 5 Jun 1972 – 16 Aug 1995

    2d Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  29. 16 Aug 1995 – 15 Nov 2005

    2d Battle Group / Battalion lineage

    25th Infantry Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage.

    Source

    Deployments & overseas operations

    1. 2004-2005

      Afghanistan

      2d Battle Group / Battalion lineage · Credited overseas service

      The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.

      Source
  30. 15 Nov 2005 – 16 Aug 2009

    2d Battle Group / Battalion lineage

    Inactive

    The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.

    Source

  31. 16 Aug 2009 – page cutoff*

    2d Battle Group / Battalion lineage

    Last documented: 1st Armored Division

    Division names are normalized across historical redesignations. This entry follows the cited unit lineage. The source establishes this last recorded status, not uninterrupted service through 2026. The striped bar extends to the page cutoff to keep the later research gap visible.

    Source

Sources and scope

Army Center of Military History lineage certificates provide the dated backbone. Regimental associations and secondary histories supplement individual operations and battalions. Where the evidence stops, the page says so. A page cutoff is not a claim that every unit directory was current on that date.

Earlier battalions are covered by common regimental service; separately dated lineages and substantiated later battalions receive their own rows or notes. A unit graphic alone is not evidence of a battalion assignment. Reserve, training and inactive organizations are distinguished from active combat units.

  1. U.S. Army Center of Military History: 5th Infantry Regiment
  2. U.S. Army Center of Military History: 1st Battalion 5th Infantry Regiment
  3. U.S. Army Center of Military History: 2d Battalion 5th Infantry Regiment
  4. Military Review: Arctic Angels and the 2022 reflagging
  5. 5th Infantry Regiment history (Wikipedia; secondary)

Patch artwork

Unmodified artwork from Wikimedia Commons; individual file pages identify the artist and license. Insignia represent the divisions, not regimental affiliation badges.