[Republican soldier holding rifle and camping gear, Mount Sollube, Spain]

[Republican soldier with rifle, Rio Segre, Aragón front, near Fraga, Spain]

[Lee Harvey Oswald standing outside his home holding rifle, Dallas]

Guerrillas retreat after stripping dead soldier for his uniform and rifle, Chalatenango

[Soldier with rifle standing behind a barricade, Tai'erzhuang, Xuzhou front, China]

[Republican soldier aiming rifle out window, Teruel, Aragón Front, Spain]

[Republican soldier aiming his rifle through a window, University City, Madrid]

[Soldiers standing in lines with their left hand on their rifles, Royal Military Academy, Brussels]

[Soldier aiming rifle from behind barricade, Tai'erzhuang, Xuzhou front, China]

[Soldier aiming rifle towards water from sand bunker, near Guangzhou, China]

U.S. Infantry attacking machine gun nests with rifle and hand grenades. Meuse-Argonne.

[Soldier aiming rifle towards water from sand bunker, near Guangzhou, China]

[Soldier aiming rifle from behind barricade, Tai'erzhuang, Xuzhou front, China]

[Soldier aiming rifle from behind barricade, Tai'erzhuang, Xuzhou front, China]

[Republican soldiers lying on the ground aiming rifles, Santa Eulalia, Aragón front, Spain]

[Republican soldier holding a rifle, Rio Segre, Aragón Front, near Fraga, Spain]

[Soldier aiming rifle from behind barricade, Tai'erzhuang, Xuzhou front, China]

[Republican soldier with rifle on destroyed bridge, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldier in a room, aiming his rifle through a hole in the wall, University City, Madrid]

[Republican soldiers crouching in grass with rifles, Rio Segre, Aragon front, near Fraga, Spain]

[Republican soldiers crouching in grass with rifles, Rio Segre, Aragon front, near Fraga, Spain]

[French air school, students marching during military drill behind bayonet rifles in Istres, France]

[French air school, students marching during military drill behind bayonet rifles in Istres, France]

[Members of the International Brigades, Madrid]