The US military LOST to Chinese and Korea troops during the Korean War when Mao, at Kim Il-Sung's request, sent Chinese military into North Korea to repel the aggressor in the war... the US, who had pushed Kim's army all the way to the Chinese/Korean border.

"How is that relevant?" I can hear being asked.

Well, for one, it's funny. The US got its ass handed to it when it was practically at peak military production (less than a decade from WWII ending) and with veteran troops who had seen combat in WWII all over the pacific. Basically, they had the perfect army at the perfect time to absolutely destroy any other army. And yet they kept losing. They had superior weaponry and all that, and using such technology yes, they did eventually fight off Mao's troops, but the point is do not assume that dumping funding into a military budget means anything beyond having cool tech.

The Iraqi insurgents defeated the US

The Taliban and other Afghan groups defeated the US

The Vietcong defeated the US

US propaganda always spins shit like "we agreed to end operations and leave" when in reality they lost the war. It's practically the calling card at this point... do a war, make billions for arms manufacturers, devastate an entire country, declare victory and leave. In a few decades wonder why those countries are "shit holes" and consider invading again.