What type of information should airborne military flights forward to FSS?

Airborne military flights are required to forward IFR flight plans and significant changes to those plans to Flight Service Stations (FSS). This is important because it ensures that air traffic control and relevant authorities have the most up-to-date information regarding the military flight's route, altitude, and any deviations from the original plan. Providing this information helps maintain the safety and efficiency of airspace operations, allowing for proper management of air traffic and coordination with other aircraft, whether they are civilian or military.

Maintaining communication regarding IFR flight plans is crucial, as it helps to minimize the risks of mid-air conflicts and ensures that all air traffic is managed effectively. Therefore, timely updates on significant changes are essential for operational safety and to facilitate a coordinated response to any unexpected situations that may arise during the flight.