Sometimes you’ve got to hand it to the bad guys for being so murderously clever in ways few could imagine. Or worse, in ways that a few forward-thinkers did imagine but that those in power didn’t take seriously.

One of those just happened in Jordan over the weekend, as I’m sure you already know, when Iran’s proxies in Syria used a drone to kill three U.S. servicemen in neighboring Jordan and injure at least 34 more. But Sunday’s attack wasn’t just another run-of-the-mill kamikaze drone strike — the kind we’ve seen more than 150 of on our forces in the region since Hamas launched its terror invasion of southern Israel on October 7.

This one was far more clever, exposing a weakness in our defenses and a failure in our imaginations — and not for the first time.

American Army Air Corps pilot and airpower pioneer Billy Mitchell died almost six years before Imperial Japan’s naval aviators crippled our battleship fleet at Pearl Harbor on December 7, 1941, but he predicted exactly such a scenario decades in advance. In 1910 he warned, “That increasing friction between Japan and the U.S. will take place in the future there can be little doubt, and that this will lead to war sooner or later seems quite certain,” and that Japan would initiate hostilities with an aerial bombardment of ships at anchor in Pearl Harbor.

Our top brass and political leaders dismissed the Japanese with racist notions about how they “were supposedly physiologically incapable of being good aviators because they lacked a sense of balance and their eyes were not right.” Navy leadership also insisted that it would be impossible for Japanese carriers to sneak up on us.

Oops.

Flash forward to 1994 and Tom Clancy’s latest techno-thriller, “Debt of Honor.” The book’s unlikely plot centered on a group of Japanese businessmen who, like the Imperial military in the 1930s, co-opted the government for their own ends. In this case, crippling the U.S. military in the Pacific to establish an all-new Greater East Asian Co-Prosperity Sphere. At the end, with the cabal defeated, one desperate Japanese ultranationalist steals a grounded JAL airliner and crashes it into the Capitol Building while Congress is fêting our victorious president, killing nearly everyone present.

Not even Clancy had imagination enough to predict such an act committed with multiple planes, each full of terrified civilians. But no one in Washington made any preparations at all, even for the all-too-realistic scenario Clancy wrote about seven years before 9/11.

While not a failure of imagination on anything like the scale of Pearl Harbor or 9/11, Iran’s proxies showed real imagination in plotting their Sunday attack. A Defense Department official, speaking anonymously, told Politico today that the Syrian militiamen saw “an opportunity” in our defenses and “exploited” it.

They flew their drone into Tower 22 undetected by tailgating one of our own drones returning from a surveillance mission. It then struck the living quarters at Tower 22, resulting in those terrible casualties.

“Check your six” is a reminder to look behind you and see if there’s a bad guy sneaking up. We either didn’t think to do that, or the drone operator was unable to do that, and the results were deadly.