172d Infantry Regiment
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
First division shown43d Infantry Division1 Jan 1944
Separate unit 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. Battalion rows follow headquarters lineages, often descended from lettered companies, rather than assuming that the old regimental battalions continued unchanged.
The older 172d Infantry, later armor/cavalry, and the mountain unit constituted in 1982 are separate lineages. The modern mountain regiment was first called the 72d Infantry. Its 3d Battalion receives a separate row.
Division patches
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
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.
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1 Jan 1916 – 1 Jan 1944
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1 Jan 1944 – 15 Aug 1945
172d Infantry Regiment
43d 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.
Deployments & overseas operations
1944-1945
Pacific theater
172d Infantry Regiment · Deployment / campaign service
Earlier regiment’s wartime service with the 43d Division. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source
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15 Aug 1945 – 1 Jan 1964
172d Infantry Regiment
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
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1 Jan 1964 – 1 Jan 1965
172d Infantry Regiment
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
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1 Jan 1965 – page cutoff*
172d Infantry Regiment
Last documented: 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. 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.
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1 Dec 1983 – 1 Oct 2006
3d Battle Group / Battalion lineage
No assigned division
The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.
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1 Oct 2006 – 1 Nov 2006
3d Battle Group / Battalion lineage
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
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1 Nov 2006 – page cutoff*
3d Battle Group / Battalion lineage
Last documented: 86th Infantry Brigade · Brigade assignment
This headquarters is not a division. Temporary attachments in the service entries below are distinct from the formal assignment. 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.
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1 Sep 1982 – 1 Apr 1983
72d / 172d Mountain Infantry · Separate 1982 lineage
No assigned division
The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.
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1 Apr 1983 – 1 Dec 1983
72d / 172d Mountain Infantry · Separate 1982 lineage
No assigned division
The cited record establishes service outside an assigned division. Higher headquarters and temporary operational attachments could still direct the unit.
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.
- Earlier 172d Infantry and its cavalry successor (Wikipedia; secondary)
- 172d Mountain Infantry, constituted in 1982 (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.
- 43d Infantry Division · file and credit · public domain
