645th Regional Support Group

645th Regional Support Group
645th Regional Support Group
Active	1999-present
Country	United States
Branch	United States Army Reserve
Size	Brigade
Part of	103rd Sustainment Command (Expeditionary)
Garrison/HQ	Southfield, Michigan
Insignia
645TH REGIONAL SUPPORT GROUP DUI

Last updated January 24, 2026

645th Regional Support Group is a United States Army Reserve unit which controls a Combat Sustainment Support Battalion within Michigan.

Organization

The 645th Regional Support Group is a subordinate unit of the 103rd Expeditionary Sustainment Command. As of January 2026 the group consists of the following units:^[1]

645th Regional Support Group, in Southfield (MI)^[1]^[2]^[3]^[4]
- Headquarters and Headquarters Company, 645th Regional Support Group, in Southfield (MI)^[4]
- 406th Combat Sustainment Support Battalion, in Ann Arbor (MI)^[4]
  - Headquarters and Headquarters Company, 406th Combat Sustainment Support Battalion, in Ann Arbor (MI)^[4]
  - 13th Quartermaster Detachment (Petroleum Liaison Team), in Livonia (MI)^[4]
  - 180th Transportation Medium Truck Company (Cargo) (EAB Linehaul), in Muskegon (MI)^[4]
    - Detachment 1, 180th Transportation Medium Truck Company (Cargo) (EAB Linehaul), in Bay City (MI)^[4]
  - 182nd Transportation Medium Truck Company (POL, 7.5K GAL) (EAB Linehaul), in Traverse City (MI)^[4]
    - Detachment 1, 182nd Transportation Medium Truck Company (POL, 7.5K GAL) (EAB Linehaul), in Bay City (MI)^[4]
  - 301st Quartermaster Company (Water Purification and Distribution), in Grand Rapids (MI)^[4]
    - 1st Platoon, 301st Quartermaster Company (Water Purification and Distribution), in Augusta (MI)^[4]
  - 401st Transportation Medium Truck Company (PLS) (EAB Tactical), in Augusta (MI)^[4]
  - 431st Quartermaster Company (Petroleum Pipeline and Terminal Operation), in Augusta (MI)^[4]
  - 858th Transportation Detachment (Movement Control Team), in Bay City (MI)^[4]
  - 919th Transportation Company (Inland Cargo Transfer Company — ICTC), in Saginaw (MI)^[4]
  - 952nd Quartermaster Company (Petroleum Pipeline and Terminal Operation), in Livonia (MI)^[4]

Abbreviations: PLS — Palletized Load System; POL — Petroleum Oil Lubricants; EAB — Echelon Above Brigade

References

1 2 "Our units". 103rd Expeditionary Sustainment Command. Retrieved January 23, 2026.
↑ "Quartermaster Cadet Brief" (PDF). Quartermaster Corps. p. 10. Retrieved January 23, 2026.
↑ "Active Duty, National Guard, and Army Reserve Transportation Assignment Locations". Transportation Corps. Retrieved January 23, 2026.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 "Michigan units". US Army Reserve. Retrieved January 23, 2026.

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[103rd_ESC-1] 1 2 "Our units". 103rd Expeditionary Sustainment Command. Retrieved January 23, 2026.

[Quartermaster_Corps-2] "Quartermaster Cadet Brief" (PDF). Quartermaster Corps. p. 10. Retrieved January 23, 2026.

[Transportation_Corps-3] "Active Duty, National Guard, and Army Reserve Transportation Assignment Locations". Transportation Corps. Retrieved January 23, 2026.

[Michigan-4] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 "Michigan units". US Army Reserve. Retrieved January 23, 2026.

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