Thanks for the replies. In non military jargon can you explain what the above means??
Oye, this'll be interesting.
In the Army Hierarchy, Corps Headquarters are about the largest unit that will deploy. We still technically have Army headquarters, but these days they don't tend to go anywhere. We also have Geographic Combatant Commands, usually aligned with each of the major theaters. EUropean COMmand has US Army Europe (USAREUR) each GCC that has an Army component, usually has a Theater Support Command (TSC) or Support Command (Expeditionary) aka Expeditionary Support Command (ESC) aligned to it. These units serve as the major hub of logistics that will support the ARmy in that theater.
For example, 21st TSC is the TSC for Europe, and provides or manages a large number of the logistics operations that occur on the continent. The TSC normally gains or maintains control of logistics units such as Sustainment Brigades, or Combat Service Support Battalions (CSSBs). There are (mainly were, but some still exist) functional battalions, such as Quartermaster, Transportation, Ordnance... These battalions will report to a Brigade, ESC or TSC depending on the structure and needs.
In this case, the units are US Army Reserve (USAR - not to be confused with USAREUR). You read bumper numbers from left to right, highest to lowest. In this case, the 377th TSC is the far left (probably). The next number could refer to an ESC, but ESCs don't usually report to TSCs unless it's under a deployed environment or support agreement. In this case, I suggested that the 316th Quartermaster Battalion is the actual next lower unit. They are located in Oklahoma but they have a number of individual companies aligned underneath them which could be spread out through a multi-state region. I'd really need the other side of the bumper number which probably indicates the actual company assigned. Either an HQ or HHC or some number combination, and then the actual trailer number.
Example, if it was assigned to the 249th QM company, 2nd Platoon, Trailer 4 you'd see something like 249QM - 2/4T or something.