They train one weekend each month and also serve 15 days of annual tour each year. The 337th Airlift Squadron is the Wing's flying unit. Westover is operated daily by a work force of about 1,200 civilians, including 500 Air Reserve Technicians. The 439th Airlift Wing is capable of providing worldwide air movement of troops, supplies, equipment and medical patients. Airlift also involves airdrop and combat offloading operations.
Support units provide communications, engineering, logistical, medical and security requirement.
The 16 C-5 Galaxies assigned to the wing at Westover represent five percent of all America's total airlift. The peacetime mission includes recruiting, training and supervision of personnel to assure mission readiness. The wing is also responsible for the management of aircraft maintenance and all assigned Air Force combat support real property, equipment and supplies. The wing converted to C-5s in 1987 and the unit eventually became designated as the 439th Airlift Wing. It is capable of delivering, to any location in the world, completely equipped combat units, support forces and all types of supplies.