Not a major weapon of distruction, not even used much, but my current preference is the Gurkha Kukri. I have one and they are the finest knives on the planet, razor sharp, heavy enough for some serious work and bloody frightening to be on the other end of one would imagine. I read one particular story where Gurkhas advanced towards a Japanese held tree line on the flank of some Scots, as the Scots began to charge suddenly all the sounds of battle were drowned out by a howl as the Gurkhas drew their Kukris (the HQ on a hill near by saw a flash as the blades were raised) and charged past the Scots into the wood, witnesses reported finding numerous fully loaded rifles along the edge of the wood where the Gurkhas dropped them as they charged in with just their blades.

Ok, so maybe not the most common or most dangerous, definatly not vital to the allied victory but definatly a great weapon.

__________________
There's no honorable way to kill, no gentle way to destroy. There is nothing good in war. Except its ending.