Positions on starships. These were independent of ranks, and the same position was usually occupied by a higher-ranking officer on a large ship than on a small one.
“The Signals Officer of a starship or space station was responsible for overseeing its...Signals Officer
“Commanding Officer was the officer in command of a vessel, military or civilian, often addressed...Commanding Officer
“First Lieutenant was the officer second in command on a warship, after her Commanding Officer...First Lieutenant
“First Lieutenant was the officer third in command on a warship, after Commanding Officer...Second Lieutenant
“Third Lieutenant was the officer fourth in command on a warship, after Commanding Officer...Third Lieutenant
“Chief Missileer was the Warrant Officer in charge of missiles on a warship, including...Chief Missileer
“Chief of Ship was the ship's engineer, and the officer in charge of all mechanical systems...Chief of Ship