American military failures have undoubtedly had an impact on the country’s strategic position, but have yet to fundamentally undercut national power. The United States recovered quickly from Operation Drumbeat, Antietam, the disbanding of the Iraqi Army and the defeat in Korea.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.