As ABN173 said, without seeing how the unit marks their vehicles, all you can do is guess. The 305th POC is located at 5550 Dower House Rd, Upper Marlboro, MD 20772. You may be able to write them and ask to be e-mailed a photo of their bumper numbers. Explain why you need it. The 305th must be one squared away unit. They received the Navy Presidential Unit Citation for their service in Iraq. They received the Navy award because they were supporting a Marine Expeditionary Force. And Marines don’t give away awards just for showing up.
If I was the Motor Sergeant and had to develop the bumper markings for your vehicle based on TB 43-0209 I would mark the vehicle:
2POG – 11POB .............305POC - 12
Make sense? Clear as mud?
Bumper markings are four groups of letters/numbers, two on the left side and two on the right. From left to right, they describe the major command, intermediate command, the unit owning the vehicle and the vehicle number.
Concerning actual vehicle numbers, 6 is usually associated with the Unit Commander (HQ-6, B-6), 5 with the unit XO (HQ-5, B-5), 4 with the S-4 or Supply (HQ-4, B-4), 3 with the S-3 or Operations (HQ-3 or B-3), 2 with the S-2 or Intelligence (HQ-2, B-2) and 1 with the S-1 or Personnel Administration (HQ-1, B-1). The number 7 is usually associated with the First Sergeant or Command Sergeant Major
Vehicle number may also indicate platoon. Thus, -12 could indicate 1st Platoon, 2nd Truck, -22 would indicate 2nd Platoon, second truck, etc. Using this system, some numbers would be skipped. A tank company’s tanks (in this case Company D) are numbered D11, D12, D13, D14, D21, D22, D23, D24, D31, D32, D33, D34. The Company Commanders tank is D66, his hummer is D6. The XO’s tank is D65, his hummer is D5. Go figure. The Supply truck is D4. The First Sergeant has a M113 APC. I’ve seen First Sergeant’s tracks marked D67, D77 and D7.
TB 43-0209 is available on the Forum under Resources/Technical Manuals. Bumper markings are covered on pages 3 and 15-17. In my opinion, the guidance is poorly written and open to interpretation. Some of the examples don’t exactly follow the guidance.