Final answer:
The d. OF-346, Operator Permit is the required credential for operating a tactical vehicle in the military. It authorizes personnel to operate government vehicles.
Step-by-step explanation:
The credential required for operating a tactical vehicle is the OF-346, Operator Permit. This permit serves as the official document that authorizes personnel to operate government vehicles and is recognized across various branches of the military. Other documents listed, such as the TM 4700-15/1, NAVMC 10627 Trip Ticket, and FMFM 4-9, Motor Transport may pertain to vehicle maintenance, trip planning, or transport tactics, but they are not credentials for operating a vehicle.
In order to operate a tactical vehicle, the credential required is the OF-346, Operator Permit.The OF-346, Operator Permit is the required credential for operating a tactical vehicle in the military. It authorizes personnel to operate government vehicles.