>>9030
>The only other thing about it that still confuses me is the color. In your first pic, Kirk and Spock have white, which can be assumed is the command color. McCoy has green, so green must be medical. Scotty and Sulu have yellow, presumably engineering/security.
In DS9, there was at least one instance of an Admiral with a yellow uniform that I recall, so tactical/security must be a branch of the unrestricted line officers in the command hierarchy. Medical and science (blues) would be restricted line officers so they wouldn't assume command in a combat situation, that's why Cmdr. Crusher shouldn't be taking over in an emergency situation, change of command falls on Lt. Redshirt (or Yellow).
http://memory-alpha.wikia.com/wiki/Toddman
>Vice Admiral Toddman was a Starfleet flag officer assigned to Starfleet Security.
https://en.wikipedia.org/wiki/Unrestricted_Line_Officer
https://en.wikipedia.org/wiki/Restricted_line_officer
https://en.wikipedia.org/wiki/Executive_officer#United_States_Navy_and_United_States_Coast_Guard
>Although not specified by 10 U.S.C., large, air-capable amphibious assault ships will have one of the two senior positions (CO or XO) occupied by a surface warfare officer and the other by a naval aviator or naval flight officer, alternating at each change of command.
https://en.wikipedia.org/wiki/Surface_warfare_insignia
>The surface warfare insignia is a military badge of the United States Navy which is issued to U.S. Navy personnel who are trained and qualified to perform duties aboard United States surface warships. There are presently four classes of the surface warfare pin, being that of line, staff, special operations, and enlisted.
>The surface warfare officer insignia is the first milestone qualification an eligible commissioned officer may receive in surface warfare.
https://en.wikipedia.org/wiki/Naval_flight_officer
https://en.wikipedia.org/wiki/Naval_Flight_Officer_insignia
>A naval flight officer (NFO) is a commissioned officer in the United States Navy or United States Marine Corps who specializes in airborne weapons and sensor systems. NFOs are not pilots (naval aviators) per se, but they may perform many "co-pilot" functions, depending on the type of aircraft.
https://en.wikipedia.org/wiki/United_States_Naval_Aviator
>A Naval Aviator is a commissioned officer or warrant officer qualified as a pilot