What document must operators have on hand while operating military vehicles?

Operators must possess a valid driver's license specifically for military vehicles while operating them to ensure that they are legally authorized and adequately trained to handle the unique characteristics and operational requirements of military vehicles. This license confirms that the operator has received the necessary training and understands the regulations and safety protocols pertinent to military transportation.

The requirement for a specialized license underscores the importance of operator competency in maintaining safety standards, operational readiness, and accountability in the military. While other documents like registration certificates, maintenance forms, and safety inspection reports may be relevant in various contexts, they do not substitute for the fundamental need for a valid driver's license, which is crucial for legal and safety compliance during operations.