(1) Any active duty military personnel while operating a commercial motor vehicle in the service of the United States Department of Defense, provided that the driver has a current valid license or permit from the Department of Defense to drive the commercial motor vehicle; and

(2) Federal, state, and county firefighters, and law enforcement officers who drive federal, state, or county fire trucks or authorized emergency vehicles; provided that they are trained by the federal, state, or county government. For purposes of this section, "authorized emergency vehicle" shall have the same meaning as in section 291C-1. [L 1990, c 342, pt of §3; am L 1996, c 16, §1; am L 2002, c 29, §1]