On 11 December 2014, Hagel accepted the Navy's recommendation to base the 20 SSCs on more powerful versions of both existing LCS designs. The SSC shall have an improved 3D air defense radar, air defense decoys, better electronic warfare system, over-the-horizon anti-ship missiles, multi-function towed array sonar, torpedo defenses, additional armor, and displace less than Flight 0 vessels. The SSC will focus on anti-submarine and anti-surface warfare; mine countermeasures will be handled by existing LCS ships. Although not designed for modularity, it will maintain the ability to carry mission modules and LCS mission package equipment, including 30 mm and 57 mm cannons (upgrading to a 76 mm gun would have had marginal benefits for increased costs), Hellfire missiles, RHIBs, and the ASW variable-depth sonar. Current plans lack vertical launchers for Standard missiles; the SSC is planned to be able to operate alone. The over-the-horizon surface-to-surface missile will likely be in the Harpoon Block II class. Other enhancements include spaced armor, installation of Mk 38 Mod 2 25 mm chain guns, improved decoy systems, the SeaRAM missile interceptor, a "lite" version of the Surface Electronic Warfare Improvement Program (SEWIP), and improved signature management through degaussing. An SSC will cost $60–$75 million more than a Flight 0 LCS, with procurement to begin by 2019. Hagel also directed the Navy to study which improvements could be added to LCSs; completed ships cannot accommodate all changes, more can be added to incomplete ones, the final number and mix of each type has yet to be determined.