Command Officers (ultimate ship’s decisions are made here):
Commanding Officer (CO) Ultimate decision maker on the ship
Executive Officer (XO) Runs the ship, trusted to make decisions
Second Officer (SO) Integral Part of Command Triumphrant
Bridge Officers (frequently found on the bridge…voice to command):
Chief Medical Officer (CMO) Looks after crew well being
Chief Science/Information Officer (CIO) Looked to for sci-fi trivia
Chief Security Officer (CSO) Welcoming committee…with a weapon!!!
Chief Engineering Officer (CEO) Ship engines…setup/hookups
Chief Communications Officer (CCO) Manages outside contacts
Assistant Chiefs backup the Chief division officers
“Acting” officers fill positions until more personel are recruited

Starfleet Ranks
Cadet (4th Class) [TOS]
Cadet 3rd Class [TOS]
Cadet 2nd Class [TOS]
Cadet 1st Class [TOS]
[unk] Cadet Crewman
[unk] Crewman Recruit
[unk] Crewman Apprentice
 Crewman
[unk] Crewman 3rd Class
[unk] Crewman 2nd Class
[unk] Crewman 1st Class
[unk] Crewman 3rd Class
Petty Officer 3rd Class
Petty Officer 2nd Class
Petty Officer 1st Class
Chief Petty Officer
Senior Chief Petty Officer
Master Chief Petty Officer
 Midshipman
         Ensign JG
         Ensign
    Ensign 3rd Class
  Ensign 2nd Class
Ensign 1st Class
    Lieutenant JG
   Lieutenant
Lieutenant Commander
  Commander
Captain