Death Star Troopers were pulled from the ranks of Imperial Navy Troopers by Grand Moff Tarkin. Only the elite among them were picked to serve on the Death Star.
As you can read on StarWars.com and numerous other sources, the Navy Trooper Corp. was formed for the Imperial Starfleet as a fighting force the Navy could use so they wouldn't be so dependant of the Army.
The Imperial Gunner is something quite different. They are usually pilot-trainees who failed their exams.
However, exactly which one of these 2 units T-21 ment does not come off clear in his post. Most likely he ment the gunner unit, but mixed up the names for them.
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