Image 1: the Brown Bess 1722, the most commonly used firearm during the American revolution.

Image 2: Springfield model 1795, the standard issue arm during the war of 1812.

Image 3: Springfield model 1803, the standard issue arm during the Mexican-American war.

Image 4: Springfield model 1861, the standard issue arm during the civil war, and is the first standard issue rifle.

Image 5: Springfield model 1873, the standard issue rifle during the great Sioux war, the first standard issue breach loading rifle.

Image 6: Springfield model 1903, the standard issue American arm during WW1, an improvement over the previous bolt-action rifle that became standard issue.

Image 7: M1 Garand, entering service in 1937, this was the standard issue American rifle during WW2, and was the first semi-automatic rifle to become standard issue.

Image 8: M16, entering service in 1965, this was the standard issue rifle during the Vietnam war, it was also the first fully automatic rifle to become standard issue.

Image 9: M4 Carbine, the standard issue firearm during the afghanistan war, and is still standard issue as i’m writing this, it’s a lighter and short variant of the M16.