91st Infantry Regiment
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
First division shownNot establishedSee source notes
Separate unit histories1 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.
The compiled order of battle lists activation as a separate regiment on 10 March 1942; only that dated observation is plotted. The following unknown interval does not imply a transfer the next day. National Archives morning reports corroborate the organization. Do not confuse it with the U.S. 91st Division or Philippine Army’s 91st Regiment.
Division patches
Division names appear in the timeline. No verified patch artwork is included for these assignments.
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.
At a glance
Assignments across time
Bar widths follow elapsed time.
Scroll horizontally on a small screen. Select a segment to open its dated entry. Diamond markers open deployments; their positions indicate the labeled year, not an exact start date or duration. Short assignments are easier to inspect in the list below.
- Division assignment
- 1st Infantry
- 2d Infantry
- 8th Infantry
- Separate headquarters
- Training / academy
- Inactive
- Unverified / last documented
Explore a date
Who were they with?
Look up the dated rows below. Service notes with incomplete dates are excluded; last-documented results do not certify a current assignment.
The dated record
Division timeline
No deployment with sufficiently established dates is plotted for this regiment. Read the assignment cards and service notes for its garrison, training and successor-unit history.
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.
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1 Jan 1916 – 10 Mar 1942
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10 Mar 1942 – 11 Mar 1942
91st Infantry Regiment
No assigned division
The compiled order of battle records activation as a separate regiment on this day. The one-day bar is a dated observation, not an assertion that separate status lasted only one day.
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11 Mar 1942 – page cutoff*
91st Infantry Regiment
Last documented: Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred. 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.
Service note · dates incomplete
91st Infantry · Company records · Archival confirmation
The National Archives index includes Company M, 91st Infantry, in 1942 and Company K in 1943. These records establish unit names, not complete division assignment dates.
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.
- National Archives: Infantry Regiment morning-report index, including the 91st Infantry in 1942
- George Nafziger: American Infantry Regiments, 1941–1945 (compiled order of battle; secondary)
Patch artwork
Unmodified artwork from Wikimedia Commons; individual file pages identify the artist and license. Insignia represent the divisions, not regimental affiliation badges.