645th Regional Support Group

The 645th Regional Support Group is a United States Army Reserve military organization headquartered in Michigan. It is a subordinate command of the 103rd Expeditionary Sustainment Command and forms part of the Army Reserve's sustainment structure. Rather than operating as a commercial brand, the group is a military headquarters responsible for organizing, directing, and supporting logistics capabilities across subordinate formations. The group's role is centered on combat service support and sustainment. In the Army context, regional support groups provide command and control for units that deliver the supplies, transportation, maintenance, petroleum and other logistical services required to keep larger formations operating. The 645th Regional Support Group controls a Combat Sustainment Support Battalion, giving it a role above the battalion level in coordinating sustainment activities and aligning subordinate capabilities with operational requirements. Its organization may include units associated with logistics functions such as the Palletized Load System, petroleum, oils and lubricants, and support at echelons above brigade. These capabilities are designed to move, store, distribute, and maintain essential supplies and equipment. The group's remit is therefore institutional and operational rather than consumer-facing: it has no commercial product portfolio, retail presence, or publicly traded ownership. The unit belongs to the United States Army Reserve rather than the active-duty Army. Army Reserve formations can support domestic missions, training activities, and mobilized overseas operations depending on national requirements. Public reference material identifies the 645th Regional Support Group as an active subordinate unit of the 103rd Expeditionary Sustainment Command. Detailed information about its establishment date, commanders, current headquarters address, subordinate order of battle, and specific deployments is not established in the supplied reference material.

The 645th Regional Support Group is a United States Army Reserve organization associated with the Army's logistics and sustainment command structure. Available reference material identifies it as a subordinate unit of the 103rd Expeditionary Sustainment Command and places it within the Army Reserve's regional support framework. The supplied material does not provide a verified activation date, lineage narrative, campaign history, or list of former commanders. The group's principal institutional function is command and control of sustainment forces. Regional support groups sit within the Army's broader logistics architecture and coordinate formations that provide transportation, maintenance, fuel, supply distribution, and related support. Their purpose is to ensure that operational units receive the personnel, materiel, services, and equipment needed to train and conduct missions. The 645th Regional Support Group controls a Combat Sustainment Support Battalion, indicating that its responsibilities extend beyond a single specialist company or detachment and include the supervision of a larger sustainment formation. The organization is connected to capabilities represented by abbreviations including PLS, meaning Palletized Load System; POL, meaning petroleum, oils and lubricants; and EAB, meaning echelon above brigade. These terms describe common areas of Army sustainment rather than consumer products. PLS equipment supports the handling and movement of palletized cargo, while POL activities support the storage and distribution of fuel and related fluids. Echelon-above-brigade support refers to logistics provided at command levels above the brigade, where sustainment assets are allocated and coordinated across wider formations. As an Army Reserve unit, the 645th Regional Support Group may train as part of the reserve component and can be mobilized or assigned to missions when required. Army Reserve support formations can contribute to domestic response, contingency operations, and overseas deployments, but no specific mission or deployment is documented in the supplied material. The group should therefore be understood primarily as a military command organization, not as a commercial brand or an independently incorporated enterprise. As of the reference point identified in the source material, January 2026, the group remains associated with the 103rd Expeditionary Sustainment Command and includes a Combat Sustainment Support Battalion among its subordinate structure. The available source does not enumerate every subordinate unit or provide a complete current order of battle. It also does not establish the group's founding year, command succession, headquarters address, or detailed operational history. Those fields remain unspecified pending authoritative Army or unit records.

• 2026

  Documented as an active Army Reserve sustainment group

  [1]645th Regional Support Groupen.wikipedia.org

  Reference material identifies the 645th Regional Support Group as a subordinate unit of the 103rd Expeditionary Sustainment Command and states that, as of January 2026, it controls a Combat Sustainment Support Battalion within Michigan.

A United States Army Reserve sustainment command focused on regional logistics coordination, command and control, and support to subordinate combat sustainment formations.

1. 1645th Regional Support Groupen.wikipedia.org