PFC Drill Instructors?

Attached is our graduation photo taken in about early September of 1952 at MCRD San Diego. This is Honor Platoon #451 and the Drill Instructors were: Sgt. K. W. Wright, Cpl. D. W. Elkins, and PFC O. H. McClelland. Documentation of PFC Drill Instructors?
T. W. Stewart #1318421