645th Regional Support Group
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:645th Regional Support Group, in Southfield- * Headquarters and Headquarters Company, 645th Regional Support Group, in Southfield
- * 406th Combat Sustainment Support Battalion, in Ann Arbor
- ** Headquarters and Headquarters Company, 406th Combat Sustainment Support Battalion, in Ann Arbor
- ** 13th Quartermaster Detachment, in Livonia
- ** 180th Transportation Medium Truck Company, in Muskegon
- *** Detachment 1, 180th Transportation Medium Truck Company, in Bay [City, Michigan|Bay City]
- ** 182nd Transportation Medium Truck Company, in Traverse City
- *** Detachment 1, 182nd Transportation Medium Truck Company, in Bay City
- ** 301st Quartermaster Company, in Grand Rapids
- *** 1st Platoon, 301st Quartermaster Company, in Augusta
- ** 401st Transportation Medium Truck Company, in Augusta
- ** 431st Quartermaster Company, in Augusta
- ** 858th Transportation Detachment, in Bay City
- ** 919th Transportation Company, in Saginaw
- ** 952nd Quartermaster Company, in Livonia