A Marine Special Operations Team member fires a M240B machine gun during night fire sustainment training in Helmand province, Afghanistan.
Tracer bullets ricochet off their targets as Japanese Ground Self-Defence Force tanks fire their machine guns, during a night session of an annual training exercise.
A soldier from the District of Columbia National Guard fires tracer rounds from an M249 machine gun, during crew-served weapon night fire training.
Machine guns fire red tracer rounds at enemy vehicles with an illumination flare overhead.
Anti-aircraft tracer rounds light up downtown Baghdad in a January 17, 1991 photograph. Meanwhile, US Air Force bombers and cruise missiles attack Baghdad during the Gulf War.
Gunnery Sgt. Dragos Coca, from the 15th Marine Expeditionary Unit, engages targets during a desert survival and tactics course.
Members of US Army Task Force 3/15 watch as tracer fire and flares light the sky, during a night live fire assault exercise in the northern Kuwaiti desert, December 9, 2002.
US Army Rangers assigned to 2nd Battalion, 75th Ranger Regiment fire at a mock enemy bunker.
Machine gun tracer rounds illuminate the sky over the US Army's Michigan Base, during an attack by militants in the Pesh Valley of Afghanistan's Kunar Province, on August 7, 2009.
Soldiers from the Colorado Army National Guard fire tracer rounds from the M240B medium machine gun with the help of night optics at Fort Hood, Texas.
Tracer bullets that are fired by Israeli soldiers in the outskirts of Jerusalem, hit and ricochet off a building in an Arab village, outside Bethlehem in the West Bank on November 1, 2000.
US military police conduct a night fire exercise.
A M3A3 Bradley from the 1st US Cavalry Regiment practices night-firing.
Soldiers fire .50-caliber machine gun rounds at the base of a training target to indicate to nearby helicopters where to fire their rockets during partnered aerial-ground integration training between US and Iraqi forces.
Marines from 2nd Battalion, 1st Marines, 11th Marine Expeditionary Unit, fire M240G medium machine guns at fixed targets in Djibouti.
