sentences:  On 7 August 2014, the SMSS was used in an exercise at Fort Benning to combine the abilities of both an unmanned ground vehicle and unmanned aerial vehicle.It involved the SMSS and an unmanned K-MAX helicopter, both Lockheed Martin systems, operating in a simulated area deemed too risky for human presence.The K-MAX autonomously transported the SMSS by sling load into the area and set it down over an intended point, releasing it upon command from a remote operator.