N.C. Gen. Stat. § 58-82A-2.5

A license issued to a pyrotechnics display operator, a proximate audience display operator, or an assistant display operator under this Article authorizes the licensee to act in that capacity until the license is suspended, revoked, or not renewed. Upon the suspension or revocation of a license, or the failure to renew a license, the licensee shall return the license to the State Fire Marshal. A pyrotechnics display operator's license, a proximate audience display operator's license, and an assistant display operator's license is valid for three years unless suspended or revoked and may be renewed every three years from the date of issuance upon payment of the applicable renewal fee.