Which major command assists mishap investigation boards pertaining to equipment safety?

The reason Air Force Materiel Command is the correct answer lies in its primary responsibilities, which include managing the acquisition and maintenance of equipment and ensuring safety standards are upheld across the Air Force. This command has a direct role in managing the oversight of equipment safety, making it pivotal in mishap investigation boards that focus on the evaluation of equipment-related incidents. Its expertise in logistics and material management positions it as a key player in identifying safety issues and implementing corrective actions to prevent future mishaps.

In performing this role, the Air Force Materiel Command collaborates closely with other commands and safety boards to analyze incidents involving equipment failure. This comprehensive involvement allows it to utilize its technical knowledge and resources effectively, thus enhancing overall safety and operational readiness within the Air Force.

The other commands, while crucial in their specific operational roles, do not have the same level of focus on equipment safety and mishap investigations as Air Force Materiel Command does, which is why they are less relevant in this particular context.