It is very commonplace to blame reversals and even defeats in America’s various wars of choice as merely a matter of lack of will. If America really wanted to win, it would win, the story goes; the failure of the US is just one where it never commits the force necessary to finish the fight. But today, that excuse rings hollow. Trump’s Operation Rough Rider, unlike Biden’s operations, utilised many of America’s most limited, expensive, and advanced weapons to try to bring the Houthis to heel. And still it surrendered. The lessons here are thus quite bleak. America’s preferred and increasingly only viable method of warfare — aerial warfare — is no longer cost-effective nor practical. But the US has no alternative modes of warfare to fall back on, which means that its days as a military hegemon are probably coming to a close.