WWII era B-17 Flying Fortress & B-24 Liberator Visit Long Beach Kids examine the bottom ball turret with two 50 caliber Browning Machine Guns under a World War II era B-17 Flying Fortress during a visit to Long Beach Airport.

.50 caliber bullets mounted on an SLA truck.

Bad news for the Axis. New stinger tails for flying fortresses are in mass installation at the Douglas Aircraft Long Beach plant. The stinger tails carry two 50-caliber guns, and are armored with battleship plate, and have additional head room and vision. Expert girl worker is shown here installing the guns doing an important war job which spells doom for the enemy.

A soldier links 50 caliber machine gun ammunition

US Military Airlifts Injured US and Iraqi Soldiers For Expert Medical Treatment A Marine stands atop a vehicle that is silhouetted against the setting sun. He is armed with a .50-caliber machine gun mounted on top of the vehicle.

A Marine with a M14 7.62 NATO Rifle in Desert Cams.

Soldier Aiming a Machine Gun A PT marksman provides a striking camera study as he aims with his 50 caliber machine gun on his boat off New Guinea. July 1943.

US Troops Fight in the Streets of Baghdad Task Force 2-69 Armor, 3rd Brigade Combat Team, 3rd Infantry Division from Fort Benning Georgia fight on the front line during the US Army's advance on Northern Baghdad. Sgt. Christopher Ferguson mans a 50-caliber machine gun during an advance in northern Baghdad.

Siksorsky CH-53E Original caption: The CH-53E is the most powerful helicopter in the U.S. military. It can move massive amounts of cargo, equipment and people. With its long range the CH-53E can go deep into enemy territory. It's speed is compatible with assault support escort helicopters and, with its lift capability, can recover and retrieve any aircraft or personnel forced down. The CH-53E was involved in the Scott O'Grady rescue in Bosnia and has been involved in every activity in which Marines have been called to participate in since then. Prime contractor is Sikorsky. The CH-53E has a crew of five: pilot and copilot, crew chief, and two gunners who man the two .50 caliber machine guns.

US Marine Sniper Team in Training A United State Marine Corps sniper team trains with 50 caliber sniper rifles. These men serve at part of the Marine Corps "land" fighting component of the United States Navy.

US Troops Take Control of Oil Fields and Cities in Southern Iraq Sgt. Christopher Ferguson mans the .50-caliber turret-mounted machine gun on a 113 APC as troops from Task Force 2-69 Armor Homebased, 3rd Brigade Combat Team, 3rd Infantry Division from Fort Benning, Georgia, drive down a highway in Iraq.

Soldiers Manning Machine Gun Soldiers at Fort Riley, Kansas, practice manning a .30 Caliber Machine Gun. April 1942.