one-pipper; one pip noun a second lieutenant UK,1915 Army, from the sleeve or shoulder insignia.
[T]hey would have made you a buckshee [rank but no pay] one-pipper and you could have trotted round for two years having the time of your life. — Graeme Kent, TheQueen’sCorporal[SixGranadaPlays], p. 85, 1959