Final answer:
An Army Service Member driving in the U.S. for official duties requires a valid civilian driver's license along with their military ID, and additional permissions may be necessary in specific cases.
Step-by-step explanation:
The subject of the question is related to driving permissions for Army Service Members (SM) within the United States. According to military regulations, an Army service member driving officially for the U.S. Army would typically be required to have a valid civilian driver's license in addition to their military identification (ID). A special permission or supervisor's approval might also be necessary in specific cases, but a valid civilian license is the fundamental legal requirement for driving on public roads, including when operating military or government-owned vehicles for official duties.