First sergeant
First sergeant was a military rank, a traditional infantry or army enlisted grade held by a non-commissioned officer. In comparison to naval rate systems, this rank was equivalent to senior chief petty officer.

This was used by the United States of America in more than one branch of their armed forces, represented as a uniform insignia by a diamond-shaped "lozenge" insignia within the three sergeant chevrons – although the number of "rocker" insignia opposing may vary depending on the first sergeant's grade.

A US Marine Corps first sergeant was assigned to aircraft carrier , one of the troops involved in the hunt for intruding time traveler Pavel Chekov in 1986. ()

On , a boy wore a first sergeant pin on a military helmet. ()

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Military ranks