navy's functionality is divided in various branches. There are seven military staff commands in the navy that are in fact administrative, directed by the several appointed Deputy Chief of the Naval Staff (DCNS) and often assisted by the Assistant Chief of the Naval Staff (ACNS) holding the rank of commodore a one-star rank senior officer reporting directly to their respective Deputy Chief of the Naval Staff (DCNS). The Deputy Chiefs Of Naval Staff are usually holding either the two-star or three-star ranks.The each and appointed Deputy Chief of the Naval Staff head or commander of their respected branch reports directly to the Chief of the Naval Staff (CNS) at Navy NHQ in Islamabad of their respected command. The military administration of the Navy under the Naval Chief based in the Navy NHQ includes its Principal Staff Commands and Principal Staff Officers: Organizations and Heads of Services, Pakistan Navy The Organizations and the Heads of Services operating in the Pakistan Navy and reporting directly to the Naval Chief are as follows: Naval components and branches Each branch in the navy offers specialisation and officers interested in joining the particular service have to pass aptitude tests before attending the specialised school that usually last for two to three years, in which the officer is able to attain a college degree. Naval Commands in Field and Commanders Since its restructuring and reorganisation over the several years, the Pakistan Navy now operates eight operational and tactical field commands and also two major type commands, two of the important commands of aviation and submarines are reporting directly to the senior Pakistan Fleet Command. Each command is headed by a senior flag officer who usually holds a ranks of three-star rank: Vice-Admiral and two-star rank: Rear-Admiral. The appointment to the senior fleet commander known as s Commander, Pakistan Fleet leads the navy's entire fleet with a responsibility of deploying the entire combat formations of the navy. Geographically, there are three administrative commanders, such as Commander Karachi (COMKAR), Commander Central Punjab (COMCEP), and Commander Northern (COMNOR), are administrating the bulk of naval installations, offshore establishments, and training facilities besides the seven oceanic based commands. In 2012, the Pakistan Navy established the Naval Strategic Forces Command that has area responsibility of exercising the deployment of sea-borne nuclear weapons and is described by the military as the "custodian of the nation's nuclear second strike capability." The peacetime commands and