Because delivering supplies can often be dangerous due to terrain or hostile territory, Lockheed Martin and Kaman Aerospace turned its K-MAX into a UAS. The helicopter can be controlled by remote control or used autonomously and can handle up to 6,000 lbs. of cargo at sea level, 4,000 lbs. at 15,000 feet. Since it was employed by the military in 2007, it has flown over 750 hours in autonomous mode and will continue to serve in Afghanistan until September.