Most of the mission modules' functions are performed by carried vehicles such as helicopters or unmanned vehicles such as the Spartan Scout, AN/WLD-1 RMS Remote Minehunting System and MQ-8B Fire Scout as part of the Navy's goal to "unman the front lines". Performing functions such as sonar sweeps for mines or submarines as well as launching torpedoes against hostile submarines at a distance from the ship is less risky. Placing sensors on remote vehicles allows the LCS to exploit concepts such as bistatic sonar. DARPA's Tactically Exploited Reconnaissance Node (TERN) program aims to build a Medium-altitude long-endurance unmanned aerial vehicle (MALE UAV) that can operate from LCS-2 and can carry a payload of out to an operational radius of .