[newzjunkey]

Certainly nearly true. It's a bit tougher here due to atmospheric concerns and the tiny window with which to prepare to hit the incoming missile. There's probably a technological overlap which can benefit an anti-missile system.

Still in all, this was a brilliant feat by the folks at JPL hitting something cosmically tiny tens of thousands of miles away at tens of thousands of miles per hour.

[Strategerist]

Eh, I don't think there's much tech overlap at all. And it wasn't really hit; it was something miles wide that we had studied the orbit of for decades, and which was stable in that orbit, that we left something IN FRONT OF.

ABM defense is a problem that is infinitely more difficult, particularly if you have humans on the other side actively attempting to spoof it (decoys, etc.)