DARPA's several hundred million dollar quest to build an airplane that can nuke anything within an hour isn't going so well. It's lost both launched prototypes, mysteriously disappearing (and presumably burning up and crashing into the ocean). Here's video.

The footage here, released by DARPA, shows the ill-fated HTV-2 Falcon's last moments before the Pentagon lost track of it. You can see it separate from each booster rocket, speed into the distance, and then, pfft. Gone. But perhaps this is all part of the plan—what greater way to achieve a surprise attack than to have absolutely no idea where the plane is? [Aviation Week]