MS U.S. Special Operation Forces soldiers with automatic rifles in Vietnam war / Jungle, Hue, Vietnam

President Lyndon B Johnson clips the Medal of Honor around the neck of army medic Lawrence Joel of Fayetteville at a ceremony at the White House / soldiers stand in full dress uniform in the White House Rose Garden carrying flags and...

Private Sales of Assault Weapons at The Nation's Gun Show at the Dulles Expo Center on December 28, 2012 in Dulles, Virginia (Footage by Getty Images)

Crowd Lines Up to Enter the Building at The Nation's Gun Show at the Dulles Expo Center on December 28, 2012 in Dulles, Virginia (Footage by Getty Images)

WS Russian military personnel surround a Ukrainian military base on March 19, 2014 in Perevalnoe, Ukraine. Russia's Constitutional Court ruled unanimously on March 19 that Russia's President Vladimir Putin acted legally by signing a...

American planes marked with a circled W on tails / small bombs drop out of planes exploding on ground impact / aerial view of bombing devastation, fires and smoke / soldiers running past burning buildings / hilltop view of thick smoke in...

Extreme long shot of exhibition floor, during the 2013 NRA Annual Meeting and Exhibits at the George R. Brown Convention Center on May 4, 2013 in Houston, Texas. More than 70,000 people attended the NRA's 3-day annual meeting that...

1 Clip - two World War 2 American GIs relax outside derelict urban warehouse - rookie radio operator holds his M1 carbine and the sergeant holds a Thompson sub-machine gun

3 Clips - two World War 2 American GIs crouch outside derelict urban warehouse - rookie radio operator holds his M1 carbine and the sergeant makes call on field telephone and holds a Thompson sub-machine gun

a group of American GIs in World War 2 olive battledress and arms advance cautiously between dilapidated industrial buildings with raised rifles in slow motion (Part 3 of 3 contiguous clips )

a group of American GIs in World War 2 olive battledress and arms advance cautiously between dilapidated industrial buildings with raised rifles in slow motion (Part 1 of 3 contiguous clips )

2 clips - clip 1 - a group of four American GIs in World War 2 olive battledress and arms take a break in their jeep - clip 2 - a rookie radio technician waits anxiously for a call

Marching Confederate soldiers cheer for General Robert E. Lee as he passes on horseback in a Civil War reenactment.

General Robert E. Lee rides a horse past cheering Confederate soldiers in a Civil War reenactment.

Older seated male Native American Indian cleaning and pointing rifle with smoke in foreground and teepee behind

Rows of rifles lean on a storage rack at a firing range.

American soldiers march with rifles during World War II.

A man looks through the telescopic scope of a rifle and fires at a shooting range.

Confederate soldiers take aim at the retreating Union army.

A Revolutionary war soldier steps forward and aims his musket.

During a Revolutionary war battle reenactment British soldiers walk away from a Colonial soldier lying face down.

Men dressed as Revolutionary soldiers fire muskets in the woods.

1970s: Fish swim. Rifle is displayed above doorway with sign. Map of North Carolina with samples of various type of rock color-coded by location.