The anti-submarine module had its focus changed from stationary to en-stride systems (while the ship is moving) that are useful in the open ocean as well as in coastal areas. One of the items to be added is a "torpedo detection capability" so that the ship can know when it is under attack. Thales has sold one CAPTAS 4 low-frequency active sonar to the U.S. Navy to be towed behind the LCS, with a potential order of 25 units. The USN will test a combination of this unit, derived from the Sonar 2087 on British Type 23 frigates, with the TB-37 multifunction towed array found on US warships. , deployment of the ASW module is planned for 2016, but the 2013 sequestration cuts could push this back to 2017.