Here’s a number that should make every American wince: $4 million. That’s what it costs to fire a single Patriot interceptor missile . Here’s another: $30,000. That’s an estimated price tag of an Iranian Shahed drone — the kind that Tehran has been lobbing across the Persian Gulf at US bases and allied cities since the start of the war four weeks ago. In other words, we’re spending at least 100 times more to shoot down each drone than our enemies spend to build one. And it’s not just the cost