artilleryman
cannoneer
gunner
machine gunner

He went onto the road where the machine gunners could see him.

He got them into it, then pulled back everyone but the machine gunners.

The machine gunners somehow managed to hold their fire in time.

The machine gunner stopped short, blocking the man behind him.

An order was given to the machine gunners, who promptly went into action.

Within a heartbeat, the machine gunner decided not to fire.

The machine gunner in the car opened fire, and he was skilled at his job.

Plugged by machine gunners who went out of their way to get him.

Then the machine gunner's eyes grew dim, and he died.

The machine gunner had made an escape through the corridor.