What information should be forwarded to FSS from airborne military flights?

The correct response to what information should be forwarded to the Flight Service Station (FSS) from airborne military flights is IFR flight plans and changes to those plans. This is crucial as FSS acts as a pivotal part of the flight planning and monitoring process, especially for military operations.

When a military flight operates under an Instrument Flight Rules (IFR) plan, it is essential that all relevant details concerning the flight plan are communicated to ensure safety and proper coordination with air traffic services. This includes the original flight plan filed and any subsequent amendments or changes made during the flight. These updates allow air traffic controllers and FSS personnel to provide accurate situational awareness, maintain separation between aircraft, and ensure compliance with airspace regulations.

The other options, while related to aviation operations, do not hold the same critical importance for submission to FSS during the flight. Flight delays and cancellations are typically communicated directly to the aircraft's operating base. Weather conditions during a flight can be reported, but they are not part of the essential documentation required by the FSS for flight monitoring. Similarly, fuel efficiency metrics, while significant for operational purposes, are not a standard reporting requirement to FSS and do not serve the immediate safety and regulatory coordination needs during a flight's progress.