The U.S. Navy has a raygun -- and it's a big one.

In a red-letter week for the military, the Naval Sea Systems command "successfully tracked, engaged, and destroyed" several unmanned aircraft with its Laser Weapon System, otherwise known as LaWS. and on the ground, iRobot unveiled its gift to the Pentagon -- the 710 Warrior designed to clear an entire 45 square meter minefield in one blow.