The US's biggest fear is who is behind the Houthis, given that they seem to have access to high-tech equipment that is beyond the Houthis' known capabilities. This raises questions about the Houthis' ability to counter and defeat advanced US military assets, such as aircraft carriers and fighter jets, which have been unmatched since World War II. Meanwhile, the US have been unable to defeat a relatively small and hightly armed terrorist group, leading some to wonder about the presence of an invisible or invincible force at play.