"Team Coast Guard" refers to the four components of the Coast Guard as a whole: Regular, Reserve, Auxiliary, and Coast Guard civilian employees. Commissioned officers Commissioned officers in the Coast Guard hold pay grades ranging from O-1 to O-10 and have the same rank structure as the Navy. Officers holding the rank of ensign (O-1) through lieutenant commander (O-4) are considered junior officers, commanders (O-5) and captains (O-6) are considered senior officers, and rear admirals (O-7) through admirals (O-10) are considered flag officers. The Commandant of the Coast Guard and the Vice Commandant of the Coast Guard are the only members of the Coast Guard authorized to hold the rank of admiral. The Coast Guard does not have medical officers or chaplains of its own. Instead, chaplains from the U.S. Navy, as well as officers from the U.S. Public Health Service Commissioned Corps are assigned to the Coast Guard to perform chaplain-related functions and medical-related functions, respectively. These officers wear Coast Guard uniforms but replace the Coast Guard insignia with that of their own service. The Navy and Coast Guard share identical officer rank insignia except that Coast Guard officers wear a gold Coast Guard Shield in lieu of a line star or staff corps officer insignia. Warrant officers Highly qualified enlisted personnel in pay grades E-6 through E-9 with a minimum of eight years' experience can compete each year for appointment as warrant officers (WO). Successful candidates are chosen by a board and then commissioned as chief warrant officer two (CWO2) in one of twenty-one specialties. Over time, chief warrant officers may be promoted to chief warrant officer three (CWO3) and chief warrant officer four (CWO4). The ranks of warrant officer (WO1) and chief warrant officer five (CWO5) are not currently used in the Coast Guard. Chief warrant officers may also compete for the Chief Warrant Officer to Lieutenant Program. If selected, the warrant officer will be promoted to lieutenant (O-3E). The "E" designates over four years' active duty service as a warrant officer or enlisted member and entitles the member to a higher rate of pay than other lieutenants. Enlisted personnel Enlisted members of the Coast Guard have pay grades from E-1 to E-9 and also follow the same rank structure as the Navy. Enlisted members in pay grades of E-4 and higher are considered petty officers and follow career development paths very similar to those of Navy