87th Infantry Regiment
Not yet constituted / organized
This timeline begins in 1916. The cited organization had not yet been constituted or organized during this interval; its formation follows.
First division shown2d Infantry Division14 Jun 1958
Separate unit histories8 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 Jul 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.
The 1918 organization and the mountain regiment constituted in 1941 are shown separately. The 10th Division’s Light, Mountain and Infantry names are normalized. The 3d Battalion’s Army Reserve command was not the 96th Infantry Division.
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 – 15 Nov 1941
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15 Nov 1941 – 22 Feb 1944
87th 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.
Deployments & overseas operations
1943
Aleutian Islands
87th Infantry Regiment · Deployment / campaign service
The regiment took part in the Kiska operation before its 10th Division assignment.
Source
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22 Feb 1944 – 21 Nov 1945
87th Infantry Regiment
10th Mountain Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1945
Italy
87th Infantry Regiment · Deployment / campaign service
Mountain infantry combat in the northern Apennines and Po Valley. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source
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21 Nov 1945 – 18 Jun 1948
87th 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.
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18 Jun 1948 – 1 Jul 1948
87th Infantry Regiment
Inactive · 10th Mountain Division
The unit was inactive but retained the division assignment shown. Paper assignments and Reserve-officer training are not active combat service.
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1 Jul 1948 – 1 Jul 1957
87th Infantry Regiment
10th Mountain Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Jul 1957 – 14 Jun 1958
1st Battle Group / Battalion lineage
10th Mountain Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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14 Jun 1958 – 4 Sep 1963
1st Battle Group / Battalion lineage
2d Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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4 Sep 1963 – 1 Oct 1983
1st Battle Group / Battalion lineage
8th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Oct 1983 – 2 May 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.
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2 May 1987 – 16 Sep 2004
1st Battle Group / Battalion lineage
10th Mountain Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
2002
Afghanistan
1st Battle Group / Battalion lineage · Deployment / campaign service
Elements fought in Operation Anaconda.
Source
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16 Sep 2004 – page cutoff*
1st Battle Group / Battalion lineage
Last documented: 10th Mountain 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.
Deployments & overseas operations
2005-2006
Iraq
1st Battle Group / Battalion lineage · Deployment / campaign service
Battalion deployment recorded in the regimental history.
Source
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1 Jul 1957 – 25 Jan 1963
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.
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25 Jan 1963 – 15 Feb 1963
2d Battle Group / Battalion lineage
Inactive · 2d Infantry Division
The unit was inactive but retained the division assignment shown. Paper assignments and Reserve-officer training are not active combat service.
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15 Feb 1963 – 4 Sep 1963
2d Battle Group / Battalion lineage
2d Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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4 Sep 1963 – 1 May 1966
2d Battle Group / Battalion lineage
8th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 May 1966 – 31 Aug 1973
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.
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31 Aug 1973 – 16 Jun 1986
2d Battle Group / Battalion lineage
8th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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16 Jun 1986 – 2 May 1988
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.
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2 May 1988 – 16 Sep 2004
2d Battle Group / Battalion lineage
10th Mountain Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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16 Sep 2004 – page cutoff*
2d Battle Group / Battalion lineage
Last documented: 10th Mountain 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.
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1 Jan 1975 – 15 Sep 1994
3d Battle Group / Battalion lineage
96th Army Reserve Command
Assigned to the 96th Army Reserve Command, an administrative command distinct from the 96th Infantry Division.
Deployments & overseas operations
1991
Germany
3d Battle Group / Battalion lineage · Deployment / campaign service
Army Reserve battalion personnel provided security support during the Gulf War; this was not a Persian Gulf combat deployment.
Source
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15 Sep 1994 – page cutoff*
3d Battle Group / Battalion lineage
Last documented: Inactive
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.
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16 Jun 1986 – 15 Jul 1995
4th Battle Group / Battalion lineage
25th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1991-1992
Sinai
4th Battle Group / Battalion lineage · Deployment / campaign service
Multinational Force and Observers peacekeeping rotation.
Source
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15 Jul 1995 – page cutoff*
4th Battle Group / Battalion lineage
Last documented: Inactive
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.
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1 May 1987 – 15 Jul 1994
5th Battle Group / Battalion lineage
193d Infantry Brigade · Separate
This headquarters is not a division. Temporary attachments in the service entries below are distinct from the formal assignment.
Deployments & overseas operations
1989
Panama
5th Battle Group / Battalion lineage · Deployment / campaign service
Participation in Operation Just Cause.
Source
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15 Jul 1994 – 15 Sep 1999
5th 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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15 Sep 1999 – page cutoff*
5th Battle Group / Battalion lineage
Last documented: Inactive
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.
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1 Jan 1916 – 1 Sep 1918
World War I organization
Not yet constituted / organized
This timeline begins in 1916. The cited organization had not yet been constituted or organized during this interval; its formation follows.
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1 Sep 1918 – 1 Oct 1918
World War I organization
Assignment not established
The available record does not establish a precise assignment throughout this interval. No division is inferred.
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1 Oct 1918 – 19 Jan 1919
World War I organization
19th Division (World War I)
Division membership is documented after organization in the preceding month. The displayed boundary brackets a month-only formation date; it is not a claimed assignment order effective on this day.
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19 Jan 1919 – 1 Jan 1920
World War I organization
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 1920 – page cutoff*
World War I organization
Last documented: Disbanded
The organization was removed from the rolls. A later reconstitution, if documented, is shown separately. 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
Company C · Headquarters lineage · Vietnam security service
Company C served in Vietnam during 1966–1972. It is not plotted as the later 3d Battalion or as an entire regiment deployed to Vietnam.
Service note · dates incomplete
Company D · Headquarters lineage · Vietnam rifle-security company
The association records Company D’s Vietnam-era service separately from the later 4th Battalion. Company service alone does not establish a divisional transfer of the parent regiment.
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.
- U.S. Army: Order of Battle of the United States Land Forces in the World War, vol. 3, part 2, divisions 11-20
- 25th Infantry Division Association: 87th Infantry battalion and company histories
- 87th Infantry Regiment history (Wikipedia; secondary)
- 87th Infantry Regiment · U.S. Army lineage
- 1st Battalion 87th Infantry Regiment · U.S. Army lineage
- 2d Battalion 87th Infantry Regiment · U.S. Army lineage
Patch artwork
Unmodified artwork from Wikimedia Commons; individual file pages identify the artist and license. Insignia represent the divisions, not regimental affiliation badges.
- 10th Mountain Division · file and credit · public domain
- 2d Infantry Division · file and credit · public domain
- 8th Infantry Division · file and credit · public domain
- 25th Infantry Division · file and credit · public domain
