In 2010 the Ministry of Defence completed a thorough study of the defence policy and issued a "White Book", or a "White Paper on Defence", calling for a major overhaul of the structure of Defence Forces. According to the document the military of the Republic of Bulgaria should include two mechanized brigades, four regiments (Logistics, Artillery, Engineering, SpecOps), four battalions (Reconnaissance, Mechanized, NBC, psychological operations) in the Land Forces; two air bases, SAM air defense base and Air force training base in the Air Force; and one naval base consisting of two homeports in the Navy. There are seven brigade level formations, including the two mechanised brigades and the special forces brigade of the army, the two air bases of the air force, the naval base and the logistical brigade of the JOC. Currently deployed units are as follows: