sentences:  Guided 57 mm ammunition is being developed for the Mk 110 for the Navy and Coast Guard, including for use on the National Security cutters.The Missile Defense duties are handled by the MK 53 NULKA decoy systems, the MK 36 SRBOC countermeasure systems also used on the FFG-7 and CG-47 programs and the Phalanx CIWS.The combination of the Mk 110 and the Phalanx give the cutter's Anti-Surface capability, limited Air-Defense capability and the capability to provide naval gunfire support.