Latvia's defense concept is based upon the Swedish-Finnish model of a rapid response force composed of a mobilization base and a small group of career professionals. The armed forces consist of mobile riflemen, an air force, and a navy. The army, navy, and air force comprise 5,864 personnel. The "zemessardze," or home guard, is an autonomous 13,890 man-strong volunteer paramilitary organization which also performs traditional national guard duties. There is a mandatory 1-year draft period of active duty, and alternative conscription for conscientious objectors is available. Defense spending has risen in recent years, and the government has committed 2% of its GDP for defense spending through 2008.