private first class

noun
  1. a soldier ranking above a private and below a corporal or specialist fourth class in the U.S. Army, and above a private and below a lance corporal in the U.S. Marine Corps.

Origin of private first class

An Americanism dating back to 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018