250lb - can carry Hellfire. New incarnation of a multi-month-on-station [previously nuclear] bomber/cruise missile concept.
Not much good for blowing up wedding processions, admittedly. But it is interesting to think about. I don't think you'd want a stock Hellfire for a vehicle like this. Whatever the payload, you're probably looking at something more like a guided bomb than a missile.
http://www.photonics.com/Article.aspx?AID=52628
"The device cut through a 15-mm-thick steel girder at a range of 1000 m, shot down several diving target unmanned aerial vehicles at a range of 2 km flying more than 50 m/s, and engaged an 82-mm-diameter steel ball representing a mortar round and traveling approximately 50 m/s. "