Which statement is true regarding a US civil airport's use by transient military aircraft?

The statement that transient military aircraft must be covered by a permit when using a US civil airport is accurate. Civil airports may accommodate military aircraft under specific conditions, often requiring a permit to ensure compliance with any local regulations, safety protocols, or logistical considerations that may differ from civilian operations. This requirement helps manage the coordination between military and civil aviation and ensures that military flights do not interfere with civilian air traffic procedures.

Understanding this aspect of airspace management is crucial because it demonstrates the regulatory framework governing military and civilian airport operations. While the other statements discuss potential privileges or requirements for military use, the necessity of a permit specifically addresses the formal process that must be followed for such use to be legal and orderly. Properly adhering to these regulations is essential for maintaining safety and efficiency in the airspace shared by both civilian and military aircraft.