Astrogator - The astrogator was a vessel's navigator. The astrogator would plot courses for the vessel, and find shipping lanes to be used. The astrogator had an assistant to the job. (HH1)
Boat Bay Officer- The BBO was an officer, who was in charge of the Boat Bay.
Boatswain - The Bosun is the highest-ranking and chief non-commissioned officer on a ship, and is in charge of all enlisted personnel, including matters of discipline.
Chief Engineer- Chief Engineer is the ranking engineering officer and in command of the engineering department on a vessel. Assisted by second and third engineer. (HH1)
Commanding Officer- The Commanding officer of a vessel was the ship's captain, and commanded the vessel. The commanding officer was abbreviated to CO. (HH1)
Communications Officer- The role of the communications officer was to monitor, relay, and transmit the communications of a vessel. (HH1)
Damage Control Specialist- The role of the damage control specialist was to coordinate with the various departments' damage control teams in repairing the most critical damaged areas of the ship. (HH2)
Engineering Officer- An engineering officer was an officer trained to maintain, to fix, and to command engineering departments on a vessel. (HH1)
Executive Officer- The executive officer was the second highest ranking officer behind the Commanding officer on a vessel. An alternative term for executive officer would be the first officer. Abbreviated as XO or Exec. (HH1)
Gunny - "Gunny" is the nickname for the rank of Gunnery Sergeant. No longer an official rank in the Royal Manticoran Marines, it is still used to refer to the senior non-commissioned Marine on board a ship. (HH6)
Helmsman- The role of Helmsman was the individual who steered the vessel. It was a non-commissioned officer's position. (HH1)
Junior Tactical Officer- The role of the Junior Tactical Officer was below the Assistant Tactical Officer with a station on the bridge. (HH2)
Master- The "commanding officer", especially on a civilian ship or a prize (Prize Master), often referred to as "Captain" or "skipper", too.
Medical Officer- The medical officer was an officer who was trained in medicine to help treat patients on a vessel or a station. Called Surgeon also. (HH1)
Officer Candidate Training Officer- The officer in charge of training and leading the academy graduates aboard through their Midshipman cruises. It was often the Assistant Tactical Officer duty. (SI1)
Operations Officer- At both the flag and individual ship level, the role of the operations officer is to liaison with other vessels in the area and help develop and coordinate tactical and strategic plans. During combat, the ship's ops officer also manages the ship's electronic warfare. (HH1)