The Swiss Armed Forces are the military forces of Switzerland, consisting of land and air service branches. Under the country's militia system, regular soldiers constitute a small part of the military and the rest are conscripts or volunteers aged 19 to 34. Because of Switzerland's long history of neutrality, the Swiss Armed Forces have not been involved in foreign wars since the early 19th century, but do participate in international peacekeeping missions. Switzerland is part of the NATO Partnership for Peace programme.