Why Didn’t the US Shoot Down That North Korean Missile?

Why Didn’t the US Shoot Down That North Korean Missile?

By Patrick Tucker August 29, 2017


This image made from video aired by North Korea's KRT on Saturday, Aug. 26, 2017 shows a photo of North Korean leader Kim Jong Un inspecting soldiers during what Korean Central News Agency called a "target=striking contest" in North Korea.

The military’s record of hitting intermediate-range missiles is less than perfect. That makes the decision to attempt an intercept much harder.

This story has been updated to reflect recent developments overnight.

North Korea launched another medium-range missile on Monday, this one right over Japan. Despite Defense Secretary Jim Mattis’ threats to shoot down missiles aimed at Guam and President Donald Trump’s Pyongyang-aimed bluster, the United States and Japan let it fly. Why?  

After the test, Trump on Tuesday said that “all options are on the table,” as every president has said for decades. But the Pentagon is still reluctant to use some of the most obvious options, such as shooting down a missile above the earth’s atmosphere with another missile fired from a ship.

The United States has 33 Aegis warships (three more are slated to arrive next year) that can launch an interceptor to hit a mid- or intermediate-range missile like the Hwasong-12 that North Korea sent over Hokkaido. Sixteen of those warships are currently in the Pacific. 

In February, MDA showed that their newest version of the standard missile, the SM-3 IIAcould hit a mid-range missile. But a second test in June was a failure. The Navy later attributed that to human error. But 50 percent is not a good record for the most advanced intermediate-range interceptor in the U.S. arsenal.

The Obama administration pushed hard for a ship-based defense against mid-range North Korean missiles aimed at Japan or Guam but found that the military has much better chance of hitting missiles that don’t fly so high.

Shooting down an enemy missile aimed at U.S. territory may be good defense, but shooting down a missile test aimed at the sea would be an act of war. Or so argued North Korea.

“Taking a shot at a North Korean missile is not something the U.S. military would do lightly or without a directive to do so,” said Karako. “if we are going to shoot at something, we will do it like we mean it. But there has to be a good reason to do it. That reason might be if there is an actual threat to the U.S., its forces, or our allies. Or it might be if the U.S. or Japan adopts a policy to intercept certain types of missiles or those on certain kinds of trajectory.  But that would have to be a deliberate policy choice.”

The highest probability of success would be to hit the enemy missile closer to the ground, during the so-called boost phase. That’s what MDA is aiming for in the future with laser-armed drones. In July, the agency put out a request for information for a high-altitude long endurance aircraft. Read that to mean a drone that can fly above 63,000 feet for a long time. According to the request, the drone should have enough power for a 140-kw laser. But that program won’t even begin testing until 2023. Until then, and likely even after, every time a missile heads toward Japan, Guam, or anywhere else, military leaders will have to decide whether attempting to shoot down North Korean missiles is worth the costs of possibly missing — or starting a war.

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