46th 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 shown9th Infantry Division5 Jul 1918
Separate unit histories7 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 20 Sep 1943; 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.
World War II service belongs to the successor armored infantry battalions. Later numbered battalion headquarters descend from companies; the old battalion number does not determine the modern lineage.
Division patches
9th Infantry Division
5th Armored Division
1st Armored Division
23d Infantry Division (Americal)
3d Armored DivisionRepresentative 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 – 5 Jul 1918
46th 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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5 Jul 1918 – 15 Feb 1919
46th Infantry Regiment
9th Infantry Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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15 Feb 1919 – 16 Nov 1921
46th 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.
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16 Nov 1921 – 31 Jul 1922
46th 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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31 Jul 1922 – 28 Aug 1941
46th Infantry Regiment
Disbanded
The organization was removed from the rolls. A later reconstitution, if documented, is shown separately.
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28 Aug 1941 – 1 Oct 1941
46th Infantry Regiment
Inactive · 5th Armored 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 1941 – 20 Sep 1943
46th Infantry Regiment
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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15 Feb 1957 – 23 Dec 1957
1st Battle Group / Battalion lineage
1st Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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23 Dec 1957 – 25 Feb 1958
1st Battle Group / Battalion lineage
Inactive · 1st Armored 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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25 Feb 1958 – 1 Apr 1958
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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1 Apr 1958 – 3 Feb 1962
1st 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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3 Feb 1962 – 12 May 1967
1st Battle Group / Battalion lineage
1st Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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12 May 1967 – 15 Feb 1969
1st Battle Group / Battalion lineage
198th Infantry Brigade · Separate
This headquarters is not a division. Temporary attachments in the service entries below are distinct from the formal assignment.
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15 Feb 1969 – 1 Nov 1971
1st Battle Group / Battalion lineage
23d Infantry Division (Americal)
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1969-1970
Vietnam
1st 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. More than one assignment falls in the opening year; this year-level service marker does not establish the assignment on a particular deployment day.
Source
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1 Nov 1971 – 13 Sep 1972
1st Battle Group / Battalion lineage
196th 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
1971
Vietnam
1st 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. More than one assignment falls in the opening year; this year-level service marker does not establish the assignment on a particular deployment day.
Source
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13 Sep 1972 – 1 Aug 1984
1st Battle Group / Battalion lineage
1st Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Aug 1984 – 30 Jan 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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30 Jan 1987 – 8 Dec 2010
1st Battle Group / Battalion lineage
TRADOC · Training
Institutional or training service. This is a command relationship, not a maneuver-division assignment.
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8 Dec 2010 – 1 Mar 2012
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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1 Mar 2012 – page cutoff*
1st 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 Oct 1957 – 3 Feb 1962
2d Battle Group / Battalion lineage
3d Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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3 Feb 1962 – 13 Sep 1972
2d Battle Group / Battalion lineage
1st Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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13 Sep 1972 – 30 Jan 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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30 Jan 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 Jul 1959 – 2 Oct 1967
5th 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 Oct 1967 – 31 Mar 1968
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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31 Mar 1968 – 15 Feb 1969
5th Battle Group / Battalion lineage
198th Infantry Brigade · Separate
This headquarters is not a division. Temporary attachments in the service entries below are distinct from the formal assignment.
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15 Feb 1969 – 22 May 1971
5th Battle Group / Battalion lineage
23d Infantry Division (Americal)
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1969-1970
Vietnam
5th 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. More than one assignment falls in the opening year; this year-level service marker does not establish the assignment on a particular deployment day.
Source
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22 May 1971 – 1 Oct 2000
5th 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 2000 – page cutoff*
5th 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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20 Sep 1943 – 8 Oct 1945
15th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1944-1945
Western Europe
15th Armored Infantry Battalion · Predecessor · Deployment / campaign service
The Company E predecessor lineage records five western European campaigns with the 5th Armored 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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8 Oct 1945 – 6 Jul 1948
15th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored 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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6 Jul 1948 – 1 Feb 1950
15th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Feb 1950 – 1 Sep 1950
15th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored 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 Sep 1950 – 16 Mar 1956
15th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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16 Mar 1956 – 15 Feb 1957
15th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored 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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20 Sep 1943 – 8 Oct 1945
47th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
Deployments & overseas operations
1944-1945
Western Europe
47th Armored Infantry Battalion · Predecessor · Deployment / campaign service
Company A predecessor lineage records Normandy, Northern France, Rhineland, Ardennes-Alsace and Central Europe campaigns. The labeled service overlaps an assignment change and is listed only once; consult the following assignment cards as well.
Source
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8 Oct 1945 – 6 Jul 1948
47th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored 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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6 Jul 1948 – 1 Feb 1950
47th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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1 Feb 1950 – 1 Sep 1950
47th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored 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 Sep 1950 – 16 Mar 1956
47th Armored Infantry Battalion · Predecessor
5th Armored Division
Division names are normalized across historical redesignations. This entry follows the cited unit lineage.
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16 Mar 1956 – 15 Feb 1957
47th Armored Infantry Battalion · Predecessor
Inactive · 5th Armored Division
The unit was inactive but retained the division assignment shown. Paper assignments and Reserve-officer training are not active combat service.
Service note · dates incomplete
3d Battle Group / Battalion lineage · Fort Knox training
The 3d Battalion is documented among the 46th Infantry training battalions at Fort Knox. Activation and inactivation boundaries require further evidence.
Service note · dates incomplete
4th Battle Group / Battalion lineage · Domestic deployment and training
The 4th Battalion helped respond to the Chicago disorders in April 1968 and later served as a training battalion at Fort Knox.
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: 1st Battalion 46th Infantry Regiment
- Army Center of Military History: 2d Battalion 46th Infantry Regiment
- Army Center of Military History: 5th Battalion 46th Infantry Regiment
- 46th 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.
- 9th Infantry Division · file and credit · public domain
- 5th Armored Division · file and credit · public domain
- 1st Armored Division · file and credit · CC BY-SA 4.0 (Noclador; unmodified)
- 23d Infantry Division (Americal) · file and credit · public domain
- 3d Armored Division · file and credit · public domain
