 in the united states navy officers are assigned to one of four communities, based on their education, training and assignments: line officers (divided into unrestricted line or url, restricted line or rl, and restricted line special duty or rl sd), staff corps officers, limited duty officers (ldo), or warrant officers (wo/cwo). each community is further subdivided by primary occupation. each occupation is identified by a four digit numerical code, called a designator. the first digit identifies the officer's community. {| class="wikitable" |- ! first digit !!colspan="2" | community |- | 1 ||colspan="2"| line (unrestricted and restricted) |- | 2 ||rowspan="4" | staff || medical & jag |- | 3 || supply corps |- | 4 || chaplain corps |- | 5 || civil engineer corps |- | 6 ||colspan="2"| limited duty |- | 7 ||colspan="2"| warrant |} the second and third digits denotes the officer's area of specialization within the line, staff corps, ldo or warrant officer communities. the final (fourth) digit denotes the officer's current type of commission. {| class="wikitable" |- ! fourth digit !! commission |- | 0 || an officer of the regular navy whose permanent grade is ensign or above |- | 1 || an officer of the regular navy whose permanent status is warrant officer or chief warrant officer (note: warrant officer (pay grade w-1) is not currently used in the u.s. navy; all u.s. navy warrant officers are currently commissioned as chief warrant officer 2 (pay grade w-2)) |- | 2 || a temporary officer of the regular navy whose permanent status is enlisted |- | 3 || an officer of the regular navy who is on the retired list |- | 4 || no longer used |- | 5 || an officer of the naval reserve (note: exceptions are designators with a 4th digit of 7, 8 or 9) |- | 7 || an officer of the naval reserve on active duty in the full time support (fts) program, previously known as the training and administration of the reserve (tar) program; includes officers of the fts program rotated to other than fts billets |- | 8 || an officer of the naval reserve who was appointed in the na
Military_ranks_of_the_United_States_Navy United_States_Navy_job_titles United_States_Navy_lists United_States_Navy_personnel