Army Regulation 840-10 
Flags, Guidons, Streamers, Tabards, and Automobile and Aircraft Plates
3-42. Automobile Plates

a. Authorization. Automobile plates are authorized for the positions of individuals indicated in table 1-1. The use of automobile plates to represent other than the individual for whom the plate is issued is prohibited. Automobile plates authorized in this section may not be used on privately owned automobiles.

b. Material and size. Automobile plates are aluminum, 6 inches high by 9 inches wide.

c. Design. The design and color of each plate are the same as the individual's flag without fringe.

d. Use and display. An automobile plate indicates the official status or rank of the senior individual occupying the vehicle. The plate will be removed or covered when the individual for whom the plate is issued is not in the vehicle.

e. Procurement. Automobile plates may be obtained from U.S Army Soldiers System Command, ATTN: AMSSC-I-SSA-SH, P.O. Box 60539, Philadelphia, PA 19145-0539, according to chapter 10 .