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 an planetary duplicate of Earth, a boy named Jahn wore a master sergeant patch, among others, on his jacket. 

Background information
This rank is used by the United States armed forces, where it is senior to Staff Sergeant and equivalent to a First Sergeant (however not in command of troops) and junior to a Sergeant Major.

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, however the patch seemed to have been sewn in US Marine colors (the Marine master sergeant patch would have crossed rifles in the center field). This style of US Marine insignia is of the pre-1959, prior to the rank restructuring of the US military, thus not showing the crossed rifles.

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