diamond
 n.— «First sergeants are required to be at least a master sergeant to wear a diamond on their sleeve, which is why they are sometimes referred to as “diamonds.” However, technical sergeants may be selected to hold the additional-duty first sergeant position, which involves many of the same responsibilities as a “diamond.”» —“‘Diamonds’ help raise Edwards’ bar” by Mike Young Edwards Air Force Base (California) Nov. 30, 2007. (source: Double-Tongued Dictionary)

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