During peacetime, Reservists and National Guardsmen spend a minimum of one weekend a month, two weeks a year annually in training. Reservists and National Guardsmen in front tier combat organizations, such as aviation units flying combat aircraft and combat support aircraft, will be funded for additional military drill duty or active duty for training in order to maintain skill levels. They may also perform additional duty in support of the active duty forces and/or in lieu of their active duty counterparts.