The armed forces have three branches: Navy, Army and Air Force. They serve primarily as a self-defense force whose mission is to protect the territorial integrity of the country and provide humanitarian assistance and security at home and abroad. As of 2008, the three branches numbered 39,200 active personnel including 7,500 women. Portuguese military expenditure in 2009 was $5.2 billion, representing 2.1 percent of GDP. Military conscription was abolished in 2004. The minimum age for voluntary recruitment is 18 years.