Guests are nominated from across the Air Force and by active and retired Regular Air Force, Air Force Reserve and Air National Guard general officers and previous NSF attendees. AWC forwards the nominations to the Secretary of the Air Force for his/her approval and his/her personal invitation. Approximately 150 selectees attend NSF each year. Specific details for NSF are provided with each nominee's invitation. Budgetary constraints preclude the Air Force from defraying guests' expenses. As a result, guests are responsible for their own transportation to Maxwell AFB, the cost of Distinguished Visitors Quarters (DVQ) lodging at Maxwell AFB, and the cost of meals.