A military killer drone, er ... missile defense took one step closer to reality. Here's a video clip of a "multiple kill vehicle" completing its hover test:
Objectives of the test included having the MKV-L hover under its own power and prove its capability to recognize and track a surrogate target in a flight environment. During the test, the MKV-L's propulsion system demonstrated maneuverability while tracking a target. The MKV-L transmitted video and flight telemetry to the ground.
Oh please. Using that logic, the first atomic bomb was also a "Defensive Weapon".
It got in the way of an entire nation of Japanese and killed them by basically ramming them at high speed. (and then exploding and irradiating the life out of them.)