Increment three will involve adding the Fleet-class unmanned surface vessel (USV) with the unmanned surface sweep system (USSS), a cable towed behind the boat. Each LCS will carry two, and they will be used for both MCM and ASW. It will mimic the acoustic and magnetic signature of a ship to fool magnetic and influence mines into detonating; introduction is expected in 2017. The final increment will be the Knifefish unmanned underwater vehicle (UUV) to find and detect buried mines in 2019.