The Stahlhelm, iconic helmet of German forces in both world wars, inspired many modern-day helmet designs, including the U.S. Kevlar field helmet.
The Mark I set the precedent for a range of self-propelled weaponry that would see widespread use in World War II and thereafter.
The English (or Welsh) longbow introduced long-range artillery to the battlefield, forever changing the nature of warfare.
The Fairbairn-Sykes fighting knife saw duty from Shanghai's back alleys to the front lines of World War II and remains in use today.
Though the Goliath tracked mine saw little action, it served as the precursor of modern radio-controlled robotic vehicles.
Russia's Mosin-Nagant Model 1891/30 was bulky and crude but deadly accurate.
Soldiers have long appreciated the use of hand signals as a means of silent communication on the front lines.
The Flammenwerfer ("flamethrower") first saw battlefield use in World War I at Verdun, France, but the weapon didn't play a decisive role in combat until World War II.
The socket bayonet, which saw duty in armies for more than a century, enabled a soldier to fix his bayonet while retaining the ability to fire.
The Brown Bess musket served British infantry units for the better part of a century.
The entrenching tool, or E-tool, has become indispensable gear for the modern field soldier.
The Roman gladius (sword) and scutum (shield) enabled the legions to conquer the known world.
During the Civil War, City-Class gunboats enabled the Union to spear the very heart of the South.