The Belgian Armed Forces have about 47,000 active troops. In 2019, Belgium's defense budget totaled €4.303 billion ($4.921 billion) representing .93% of its GDP. They are organized into one unified structure which consists of four main components: Land Component or the Army, Air Component or the Air Force, Marine Component or the Navy and the Medical Component. The operational commands of the four components are subordinate to the Staff Department for Operations and Training of the Ministry of Defense, which is headed by the Assistant Chief of Staff Operations and Training, and to the Chief of Defense.