Raytheon Missiles & Defense, Tucson, Arizona, is awarded a $49,046,788 firm-fixed-price modification to previously awarded contract (N00024-21-C-5406) for the procurement of four MK-15 Close-In Weapon Systems (CIWS) Block 0 to Block 1B Baseline 2 Upgrade and Conversion and related equipment for the Republic of Korea. Work will be performed in Louisville, Kentucky (19%); Williston, Vermont (14%); Tucson, Arizona (11%); Tempe, Arizona (8%); Andover, Massachusetts (4%); Mason, Ohio ( 4%); Melbourne, Florida (3%); Joplin, Missouri (2%); Hauppauge, New York (2%); Grand Rapids, Michigan (2%); Dayton, Ohio (1%); Anaheim, California (1%); Palo Alto, California (1%); Norcross, Georgia (1%); Phoenix, Arizona (1%), and various locations with less than 1% each (total 26%). Work is expected to be completed by May 2025. Foreign military sales (Korea) funding in the amount of $49,046,788 will be obligated at time of award and will not expire at the end of the current fiscal year. The Naval Sea Systems Command, Washington, District of Columbia, is the contracting activity.