What If US Marines Fought the World's Largest Armies?

The US Marine Corps has about 170,000 active Marines. That's it. They have their own air wing, their own light armor, their own artillery: basically a completely self-contained fighting force that happens to be smaller than many armies' support staff. We're sending that against six of the largest armies on earth, smallest to largest, to see what happens. One rule: everyone fights at current strength with real doctrine and gear. Let's go. Made by my Last Brain Cell