Final answer:
A military treatment facility issues a nonavailability statement when it cannot provide the required care, allowing patients to seek care from civilian providers.
Step-by-step explanation:
A certificate issued by a military treatment facility stating that the facility cannot provide the needed care is called a nonavailability statement. This type of statement is used when the facility does not have the resources, personnel, or capabilities to provide a particular type of care or service required by the patient. Upon receipt, the nonavailability statement typically allows the patient to seek necessary medical services from a civilian provider, potentially covered by the military's healthcare system.