The 439 Force Support Squadron (FSS) is a unit under the Air Force Reserve Command (AFRC) of the United States Air Force (USAF). Its primary role is to provide support services for Air Force personnel and their families, ensuring their well-being and readiness. This includes services such as food service, logistics, morale, welfare, recreation, and transportation. The 439 FSS operates from various locations, with its headquarters at Fort McCoy, Wisconsin. The unit plays a crucial role in the overall mission readiness of the U.S. Air Force by ensuring that personnel have the necessary resources to perform their duties effectively.