Why does the U.S. military seem stymied in the war with Iran?

The U.S. military faces significant operational challenges in potential conflict with Iran, including depleted long-range missile stockpiles, extended troop deployments, and reduced regional military presence. Meanwhile, Iran is rapidly developing lower-cost weapons systems, creating an asymmetric disadvantage for American forces. According to defense analyst Stacie Pettyjohn, these factors combine to leave the U.S. military in a disadvantaged position.