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 Earth Two, a boy named Jahn wore a master sergeant patch, among others, on his jacket. (TOS: "Miri")

The insignia seen on Jahn's jacket was styled like a US Army master sergeant – three chevrons above and three rockers below, with no center insignia – sewn onto US Marine Corps colors, pre-1959 style insignia.

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. (TOS: "Patterns of Force")

According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 9), major sergeant was a rank in the Military Assault Command Operations in the 2150s. The insignia for this rank was on display in a diagran of MACO rank and insignia.

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