Raytheon Integrated Defense Systems, Portsmouth, Rhode Island, is being awarded a $29,746,484 modification to previously awarded contract N00024-11-C-6410 to exercise option year four for the production of MK54 Mod 0 Lightweight Torpedo (LWT) kits and related engineering and repair services for upgrade of Navy LWTs.  This modification also involves foreign military sales to India, Turkey and Australia.  Although the MK54 Mod 0 LWT is primarily intended as an anti-submarine torpedo for littoral scenarios, its basic capabilities includes operation in both shallow and deep water acoustic environmental conditions, and exceeds MK46 Anti-Submarine Warfare capabilities in deep-water scenarios. This option exercise provides the Navy with a quantity of 100 MK54 Mod 0 LWT kits including warranty and a quantity of 68 foreign military sales MK54 Mod 0 LWT kits including warranty and spares.  Work will be performed in Keyport, Washington (80 percent); and Portsmouth, Rhode Island (20 percent), and is expected to be completed by September 2017.  Fiscal 2015 weapons procurement (Navy), foreign military sales, and fiscal 2015 operation and maintenance (Navy) funding in the amount of $54,218 is being obligated, and will expire at the end of the current fiscal year.  The Naval Sea Systems Command, Washington, District of Columbia, is the contracting activity.