Ariz. Rev. Stat. § 28-776
E. The sheriff in each county may certify any person who holds at least a valid class A, B, C, D or M driver license issued by this state as a certified driver of a funeral escort vehicle or military escort vehicle if the person:
H. A person:
I. For the purposes of this section:
2. "Military procession" means two or more vehicles, including a military escort vehicle, accompanying any of the following: