Final answer:
Unless specified by the director of aerospace safety or nuclear surety, the major command is tasked with investigating nuclear mishaps to enforce safety regulations and standards.
Step-by-step explanation:
The question relates to the responsibility of investigating nuclear mishaps within military operations. Specifically, unless the director of aerospace safety or the director of nuclear surety assumes responsibility, the major command is traditionally responsible for ensuring that any nuclear incidents are thoroughly investigated.
This oversight is crucial to maintain the safety and security of nuclear materials and operations.
The responsible command must enforce regulations and develop standards to protect all personnel and the environment from the potential hazards associated with nuclear activities. Furthermore, the command has the authority to supervise the transmission and security of nuclear materials.