Final answer:
A waiver is required for military air traffic controllers to transfer to civilian ATC duties, and this waiver must be approved by the Federal Aviation Administration (FAA).
Step-by-step explanation:
Military air traffic controllers who wish to transfer to perform ATC (Air Traffic Control) duties are required to obtain a waiver. This waiver is crucial because military air traffic control operations may differ from those governed by civilian authorities, necessitating a transition process to ensure adherence to civilian standards and protocols. As per the options provided, the correct authority to approve such a waiver for transferring military air traffic controllers to civilian ATC duties is the Federal Aviation Administration (FAA). The FAA is responsible for regulating all aspects of civil aviation in the United States, including the certification and oversight of civil air traffic controllers.