Infantry timelines · Infantry numbers 1–200

122d Infantry Regiment

A century of division assignments

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

122d Infantry Regiment unit graphic
122d Infantry Regiment
First division shown31st Infantry Division1 Jan 1918
Separate unit histories0 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. Battalion rows follow headquarters lineages, often descended from lettered companies, rather than assuming that the old regimental battalions continued unchanged.

Approximate wartime windows identify documented affiliations within the labeled years. Their boundaries are coverage limits, not assignment or inactivation orders. Unverified intervals remain visible; common regimental service does not establish the later assignments of each battalion. The 1939 conversion produced field and coast artillery organizations. The postwar infantry served in the 48th Division before later training-institute service.

Division patches

31st Infantry 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 – 1 Jan 1918

    122d Infantry Regiment

    Assignment not established

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

    Source

  2. 1 Jan 1918 – 1 Jan 1919

    122d Infantry Regiment

    31st Infantry Division · Approximate period

    Approximate evidence window: the cited history records this wartime affiliation, but these displayed boundaries are not effective-date assignment orders. The date lookup identifies evidence within this window, not confirmed membership on each day.

    Source

    Deployments & overseas operations

    1. 1918

      France · World War I

      122d Infantry Regiment · Deployment / campaign service

      Includes combat or depot/replacement service as described in the regimental history; not every regiment fought as an intact formation.

      Source
  3. 1 Jan 1919 – 1 Jul 1939

    122d Infantry Regiment

    Assignment not established

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

    Source

  4. 1 Jul 1939 – 1 Jan 1947

    122d Infantry Regiment

    Converted to another branch

    Lineage service in another branch or under a predecessor designation. This interval is not plotted as an infantry maneuver-division assignment.

    Source

  5. 1 Jan 1947 – 1 Jan 1948

    122d Infantry Regiment

    Assignment not established

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

    Source

  6. 1 Jan 1948 – 1 Jan 1955

    122d Infantry Regiment

    48th Infantry Division · Approximate period

    Approximate evidence window: the cited history records this wartime affiliation, but these displayed boundaries are not effective-date assignment orders. The date lookup identifies evidence within this window, not confirmed membership on each day.

    Source

  7. 1 Jan 1955 – 1 Jan 1956

    122d Infantry Regiment

    Assignment not established

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

    Source

  8. 1 Jan 1956 – page cutoff*

    122d Infantry Regiment

    Last documented: Training · No assigned division · Approximate period

    Approximate evidence window: the cited history records this wartime affiliation, but these displayed boundaries are not effective-date assignment orders. The date lookup identifies evidence within this window, not confirmed membership on each day. 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, regimental associations and secondary histories document assignments, operations and battalions. Exact lineage dates and approximate historical coverage are distinguished. 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. 122d 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.