Master sergeant
Master sergeant was a military rank, a traditional infantry or army enlisted grade held by a non-commissioned officer. In comparison to naval ranking systems, this rank was approximately equivalent to the naval chief petty officer or senior chief petty officer grades. On Earth, the World War II-era German Nazi SS used the comparable rank of hauptscharführer. 

On the planet , a boy named Jahn wore a master sergeant patch, among others, on his jacket. ()

The Ekosian Nazi SS used ranks based on the original Earth ranks during the 2260s. One official who wore the collar patch for a hauptscharführer (and a general's shoulder strap) was, in 2268, decidedly considered among the top, most trusted, officials on Ekos. ()

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es:Sargento mayor
Military ranks