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. Some states also maintain non-federal state defense forces as a small reserve for their National Guard units. These units cannot be deployed beyond the borders of their states and cannot be federalized. References External links Support for Britain's Reservists and Employers (SaBRE) Military specialisms