39th 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 shown4th Infantry Division19 Nov 1917
Separate unit histories4 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 Apr 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 common row closes when the 2d Battle Group separated in April 1957. Remaining regimental elements retained the 9th Division affiliation until the December 1957 reorganization.
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 May 1917
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15 May 1917 – 19 Nov 1917
39th 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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19 Nov 1917 – 21 Sep 1921
39th Infantry Regiment
4th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1918
France
39th Infantry Regiment · Campaign service
Campaign participation is recorded in the cited history. The year label summarizes campaign service, not an exact overseas tour.
Source
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21 Sep 1921 – 15 Aug 1927
39th Infantry Regiment
Inactive · 4th 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 Aug 1927 – 1 Oct 1933
39th Infantry Regiment
Inactive · 7th 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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1 Oct 1933 – 1 Aug 1940
39th Infantry Regiment
Inactive · 4th 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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1 Aug 1940 – 9 Aug 1940
39th Infantry Regiment
Inactive · 9th 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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9 Aug 1940 – 30 Nov 1946
39th Infantry Regiment
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1942-1943
North Africa and Sicily
39th Infantry Regiment · Campaign service
Campaign participation is recorded in the cited history. The year label summarizes campaign service, not an exact overseas tour.
Source1944-1945
Western Europe
39th Infantry Regiment · Campaign service
Campaign participation is recorded in the cited history. The year label summarizes campaign service, not an exact overseas tour.
Source
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30 Nov 1946 – 15 Jul 1947
39th 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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15 Jul 1947 – 1 Apr 1957
39th Infantry Regiment
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Apr 1957 – 1 Oct 1963
2d Battle Group / Battalion lineage
4th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Oct 1963 – 1 Feb 1966
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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1 Feb 1966 – 25 Sep 1969
2d Battle Group / Battalion lineage
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1967-1969
Vietnam
2d Battle Group / Battalion lineage · Credited overseas service
The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source
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25 Sep 1969 – 21 Apr 1972
2d Battle Group / Battalion lineage
Inactive · 9th 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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21 Apr 1972 – 21 Jan 1983
2d Battle Group / Battalion lineage
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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21 Jan 1983 – 3 Apr 1987
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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3 Apr 1987 – page cutoff*
2d Battle Group / Battalion lineage
Last documented: TRADOC · Training
Institutional or training service. This is a command relationship, not a 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 Apr 1957 – 1 Dec 1957
3d Battle Group / Battalion lineage
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Dec 1957 – 1 Feb 1966
3d 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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1 Feb 1966 – 25 Sep 1969
3d Battle Group / Battalion lineage
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1967-1969
Vietnam
3d Battle Group / Battalion lineage · Credited overseas service
The Army lineage lists a unit decoration for service in these years. These are credited service years, not exact deployment and return dates. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source
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25 Sep 1969 – 21 Jul 1972
3d Battle Group / Battalion lineage
Inactive · 9th 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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21 Jul 1972 – 21 Jan 1983
3d Battle Group / Battalion lineage
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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21 Jan 1983 – 3 Apr 1987
3d 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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3 Apr 1987 – 16 Dec 1988
3d Battle Group / Battalion lineage
TRADOC · Training
Institutional or training service. This is a command relationship, not a maneuver-division assignment.
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16 Dec 1988 – 1 Oct 2016
3d 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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1 Oct 2016 – page cutoff*
3d Battle Group / Battalion lineage
Last documented: TRADOC · Training
Institutional or training service. This is a command relationship, not a 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.
Service note · dates incomplete
1st Battle Group / Battalion lineage · Germany
The 1st Battalion served with the 8th Infantry Division at Baumholder during the early 1970s. Exact assignment boundaries are not established by this account.
Service note · dates incomplete
4th Battle Group / Battalion lineage · Vietnam and training
The 4th Battalion served with the 9th Infantry Division in Vietnam after activation in 1966. Later training service included Fort Dix and Fort Jackson; another activation occurred in 2017.
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.
- Army Center of Military History: 2d Battalion 39th Infantry Regiment
- Army Center of Military History: 3d Battalion 39th Infantry Regiment
- 39th 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.
- 4th Infantry Division · file and credit · public domain
- 7th Infantry Division · file and credit · public domain
- 9th Infantry Division · file and credit · public domain
