Infantry timelines · Infantry numbers 1–200
A century of division assignments
1916–2026 · Regimental service, battle groups, battalions and deployments.
No U.S. Regular Army infantry regiment was constituted under this number. The numbering row and any separately numbered battalion histories have different identities.
Regular Army infantry regimental numbers 92–100 were allotted but never constituted. This is a numbering record, not a regiment with invented divisions or battalions. Separately numbered battalions, where documented, are identified below and do not establish a regiment of the same number.
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
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.
Explore a date
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
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.
99th Infantry · Regimental numbering record
This regimental number was never constituted in the numbering history cited below. Related separate battalions are distinct organizations, not battalions of a regiment with this number. 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.
99th Infantry Battalion (Separate)
The available record does not establish a precise assignment throughout this interval. No division is inferred.
99th Infantry Battalion (Separate)
The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.
1944-1945
99th Infantry Battalion (Separate) · Deployment / campaign service
The Norwegian-American separate battalion served in France, Belgium and Germany. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source99th Infantry Battalion (Separate)
The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased.
99th Infantry Battalion (Separate)
The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.
99th Infantry Battalion (Separate)
Training service outside an established maneuver-division assignment. This label does not imply membership in the later TRADOC command.
99th Infantry Battalion (Separate)
The unit or its headquarters lineage was inactive. This status does not imply that every inherited honor or divisional affiliation was erased. 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.
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.
Unmodified artwork from Wikimedia Commons; individual file pages identify the artist and license. Insignia represent the divisions, not regimental affiliation badges.