WW2 showed only extreme, complex brutality can force the collapse of fanatical political organizations.

Nazis didn't fold until Russians were destroying Berlin. Read the civilian primary sources, because that's the price of victory.

What Yemen is and has always been is a stalemate. The Houthi can't come out of Yemen and attack the House of Saud. The Saudis tried to invade Yemen, it went very poorly, they are not a competent military force and can't be one because their culture is incompatible with the needs of modern warfare. There is currently no solution other than anti-missile escort duty.

and the US occupying 33,000 square miles of mountains? We don't have sufficient troop per square mile density required for that occupation.

Yes, logistics matter. That's the complex part of the brutality.

For as much as we celebrate D-Day, it's 100 miles from Portsmouth to Omaha Beach. In the Pacific theater it was 6000 miles from LA to the Solomons.

We're still fighting the Cold War in Ukraine. Afghanistan 2.0.

For Germany and Japan it went great until they opened separate 2 front wars their economies couldn't sustain. Germany's inability to take violence across the channel into UK is why they never closed that front out.

Remember when Romney said Russia, and Obama laughed at him and it became a punchline?

Yeah...