The Army has a new laser-based 3D mapping robot, one that can create imagery of a surrounding area using, yes, lasers. It uses a mirror-based LIDAR system that "bounces a laser off a rapidly rotating mirror and gleans environmental information from how long it takes for each pulse to bounce back." Oh, OK!
What's really good about this for the Army is that it does what normally requires a $100,000 setup for about 1/5th of the cost. And what saves the Army money saves taxpayers money, at least in theory. So hey, thanks, robot!