United States Navy

==== Warrant officers ====
{{main|Warrant officer (United States)}}
{{USN Warrant Officer}}

Warrant and chief warrant officer ranks are held by technical specialists who direct specific activities essential to the proper operation of the ship, which also require commissioned officer authority.<ref name="WO-4">{{cite web|url=http://www.usawoa.org/woheritage//Hist_of_Army_WO.htm#Introduction|title=History of the Warrant Officer|publisher=United States Army Warrant Officer Association|access-date=18 March 2007|archive-url=https://web.archive.org/web/20070316213856/http://www.usawoa.org/woheritage/Hist_of_Army_WO.htm#Introduction|archive-date=16 March 2007}}</ref> Navy warrant officers serve in 30 specialties covering five categories. Warrant officers should not be confused with the [[limited duty officer]] (LDO) in the Navy. Warrant officers perform duties that are directly related to their previous enlisted service and specialized training. This allows the Navy to capitalize on the experience of warrant officers without having to frequently transition them to other duty assignments for advancement.<ref name="WO-5">{{cite web|url=http://www.usawoa.org/woheritage//WO_Prog_Other_Svc.htm|title=Warrant Officer Programs of Other Services|publisher=United States Army Warrant Officer Association|access-date=18 March 2007|archive-url=https://web.archive.org/web/20061230211659/http://www.usawoa.org/woheritage/WO_Prog_Other_Svc.htm|archive-date=30 December 2006}}</ref> Most Navy warrant officers are accessed from the [[Chief petty officer (United States)|chief petty officer]] pay grades, E-7 through E-9, analogous to a senior non-commissioned officer in the other services, and must have a minimum 14 years in service.<ref>{{cite web|url=http://www.public.navy.mil/bupers-npc/reference/messages/Documents/NAVADMINS/NAV2016/NAV16144.txt|title=Active duty limited duty officer and chief warrant officer in service procurement boards |work=[[US Navy]]|publisher=[[United States Government]]|location=Washington, D.C.|access-date=8 March 2017|archive-date=16 February 2017|archive-url=https://web.archive.org/web/20170216213241/http://www.public.navy.mil/bupers-npc/reference/messages/Documents/NAVADMINS/NAV2016/NAV16144.txt}}</ref>