The Turkish Armed Forces (TAF; Turkish: Türk Silahlı Kuvvetleri, TSK) are the military forces of the Republic of Turkey. They consist of the Army, the Navy and the Air Force. The Gendarmerie and the Coast Guard, both of which have law enforcement and military functions, operate as components of the internal security forces in peacetime, and are subordinate to the Ministry of Interior. In wartime, they are subordinate to the Army and Navy. The President of Turkey is the military's overall head. After becoming a member of the NATO Alliance on 18 February 1952, Turkey initiated a comprehensive modernization program for its Armed Forces. Towards the end of the 1980s, a second restructuring process was initiated. NATO officials also state that the modern day Turkish Armed Forces are "very experienced and well-trained".