What must the door gunners satisfactorily pass according to AR 40-501?

According to AR 40-501, door gunners are required to satisfactorily pass a flight physical. This physical evaluation is essential to ensure that personnel are medically fit to perform their duties while flying, which includes operating weapons systems from a moving aircraft. The flying environment presents unique stresses and considerations, and being medically fit is crucial for safety and effectiveness in fulfilling their roles. Without passing this flight physical, door gunners wouldn't be certified to operate in such conditions, making this requirement fundamental to maintaining overall operational readiness and safety in the field.

The other options, while relevant to overall flight training and operations, do not specifically address the core medical evaluation required for door gunners under AR 40-501.