Wikipedia
Master gunner is an appointment of the warrant officer rank in several armed forces.
Usage examples of "master gunner".
Jack's whole heart and soul had been turned to the chase - he had been engaged in naval war for more than twenty years and he was very much of a sea-predator, perfectly single-minded when there was the near likelihood of violent action - and now in the most natural voice in the world he said, 'Good day to you, master gunner.
Hart, USMCR, Master Gunner Ernest Zimmerman, USMC, and Lieutenant David R.
I KNOW THEY WILL DO THEIR VERY BEST, NOT ONLY AS FELLOW MARINES, BUT BECAUSE AMONG THEM IS A MASTER GUNNER WHO KNEW DICK IN NORTH CAROLINA, AND HELD HIM IN BOTH HIGH ESTEEM AND AFFECTION.
Steve then took a long drag on his cigarette while his company master gunner rummaged around in the back of the messy Bradley looking for his driver's night vision goggles.
The gun was in the care of Stampfer, who'd followed Piet as master gunner through a series of commands.
Then he grinned with the joy of a true craftsman, the feral grin of a master gunner facing a problem that he was born to solve.
He had heard the usual orders, the hoarse cry of Meares the master gunner and his mate, and he knew that a salute was to be fired.
Ayres, the grey-haired master gunner, could not hear him from the forecastle, but he had seen his young captain's hand slice down.