U.S. Naval Institute's Proceedings a couple of years ago.
The caption at the bottom of the photo says:
"GREAT IDEA SARGE! In Korea in 1952, Technical Sergeant John Boitnott, right, was one persuasive Marine sniper. He convinced Private First Class Henry Friday,
left, to help him finger enemy snipers by running back and forth in the trench they shared - like a duck in a shooting gallery - until the bad guys gave themselves away by shooting at his pal. In this way, Boitnott bagged nine
snipers with nine shoots from his M-1C, all at distances of about 900 yards. The team worked their deadly magic until the company commander learned about it, went ballistic, and put an end to the scheme."