I'm not sure I'd call that an invasion, it was a 3 week assualt on the border in response to Vietnam deciding to go overthrow and occupy Cambodia and Laos, both

I'm not sure I'd call that an invasion, it was a 3 week assualt on the border in response to Vietnam deciding to go overthrow and occupy Cambodia and Laos, both of whom were supported by China. There's not enough room in the comments to write down the last 50 years of US and allies boots on ground adventures bringing "peace" to the world.