Which agency standardizes military ejection seat safety protocols?

The correct choice is the United States Air Force, as it is the agency responsible for developing and implementing specific safety protocols related to military ejection seats. The Air Force has a vested interest in ensuring the safety and reliability of ejection seats for its aircrew, given the potential risks involved when operating military aircraft. This includes standardizing procedures for their use, maintenance, and testing to enhance crew safety during emergencies.

The other agencies listed do not specifically focus on military ejection seat protocols. The Federal Aviation Administration governs civilian aviation safety and regulations, while the National Transportation Safety Board primarily investigates transportation accidents across various modes of transport, including aviation. The Department of Defense does dictate overarching military policies but does not standardize protocols at the operational level related to specific equipment such as ejection seats; that specific role falls primarily under the jurisdiction of the United States Air Force.