The Droid WAC-47 also held the rank of pilot in D-Squad. Some well known Clone pilots include Oddball, Matchstick, Broadside, Jag and Warthog. Below them were simply regular clone pilots, sitting at the bottom of the command chain.

They were also the pilots of the Republic Gunships. Rather than being naval officers, lieutenants were pilots, often leading Starfighter squadrons second only to the Jedi leaders. The next position in the Republic Navy’s chain of command was Lieutenant. The next inferior position was that of a Navigation Officer, who worked on the Republic Fleet starships.

Captains also had the same insignia as commanders, however they were outranked by Commanders, even though the positions were nearly identical. This rank was often filled in by Clones during the Clone Wars, as other navy officers were either working as Admirals or in other naval fields. The next rank, Commander, has an insignia of a single row, consisting of two red squares and a blue square on the right end. Well known republic Admirals include Admiral Tao, Admiral Yularen and Admiral Tarkin. This, in canon, is the earliest known use of red and blue squares on a silver plating as rank insignias. Republic Admirals wore grey uniforms, with their rank insignia made of three red squares in a top row, and a two square row of blue underneath in a bottom row. The ranks within the Republic Navy were somewhat unclear, but there were simply six concrete ranks that can be ordered, with Admiral being the highest rank in the Republic Navy, and Pilot being the lowest (as part of the Starfighter Corps). These officers were then filtered into the ranks of the Republic Navy. Therefore there were many officers such as Yularen who were already serving the Galactic Republic when the Clones first came. They did, however, have some groups of security, the Senate Bureau of Intelligence amongst them. You can help Wookieepedia by expanding it.The Galactic Republic did not have a full military or Navy prior to the Clone Wars. This article is a stub about the Galactic Empire. Thrawn would eventually rise to the rank of Grand Admiral. The Chiss Thrawn held the rank of Senior Lieutenant for a time before being promoted to captain. It ranked above Junior Lieutenant, and below captain. Senior Lieutenant was a junior officer rank within the starfleet of the Galactic Empire. ' Only he's not a Senior Lieutenant anymore, is he? I'm betting he's just been promoted to captain.' ― Eli Vanto and Culper talking about Moff Ghadi ' His excellency has no interest in what happens to a lowly Senior Lieutenant.'

Star wars imperial navy ranks canon