Final answer:
Plane captains are monitored every six months for proficiency by a QAR or CDQAR who is also PC designated, ensuring they maintain the necessary operational standards and safety.
Step-by-step explanation:
Plane captains must be monitored for proficiency every six months by a QAR (Quality Assurance Representative) or CDQAR (Collateral Duty Quality Assurance Representative) who is also PC (Plane Captain) designated. The safety and efficiency of military aircraft operations depend on the consistent proficiency of the plane captain, who is responsible for the final pre-flight check and ensuring the aircraft is fit for the mission. Therefore, regular monitoring by a qualified QAR or CDQAR is imperative for maintaining operational standards and the pilot's safety.