What form must PSAs complete for each article to be forwarded when forwarding RUSH baggage?

The proper form that PSAs must complete when forwarding RUSH baggage is AMC Form 57. This form is specifically designed for documenting the forwarding of expedited baggage, ensuring that all relevant details are captured for traceability and management of time-sensitive luggage. The use of AMC Form 57 helps maintain the military's operational efficiency by providing a standardized method for processing urgent baggage, which is critical in situations where timely delivery is paramount.

Other forms mentioned are used for different purposes. For example, DD Form 2131 is not relevant to baggage handling but relates to personnel assignments and tracking. PSA Form 300 is typically used for other types of baggage or service documentation rather than for RUSH baggage specifically. Baggage Handling Form 82 serves a different function in the baggage management process and does not meet the specific requirements for RUSH baggage forwarding. Therefore, AMC Form 57 is the correct choice as it directly aligns with the procedures for handling urgent baggage.