A machine gunner with Weapons Company, 3rd Battalion, 3rd Marine Regiment fires a M249 light machine gun during a live fire night shoot here, May 28. The Marines were being tested on whether they could keep security throughout the night and effectively fire upon targets. - A machine gunner with Weapons Company, 3rd Battalion, 3rd Marine Regiment fires a M249 light machine gun during a live fire night shoot here, May 28. The Marines were being tested on whether they could keep security throughout the night and effectively fire upon targets.