The National Armed Forces (Latvian: ''Nacionālie bruņotie spēki (NAF)'') of Latvia consists of the Land Forces, Naval Forces, Air Force, National Guard, Special Tasks Unit, Military Police, NAF staff Battalion, Training and Doctrine Command, and Logistics Command. Latvia's defence concept is based upon the Swedish-Finnish model of a rapid response force composed of a mobilisation base and a small group of career professionals. From 1 January 2007, Latvia switched to a professional fully contract-based army.