The United States has authorized a potential $111.8 million Foreign Military Sales package supplying South Korea with 624 additional GBU-39B Small Diameter Bombs. The approval expands an earlier, smaller request, pushing Seoul’s total planned SDB inventory beyond 1,000 units when combined with previous procurements. South Korean officials see the package as a practical upgrade that maintains alignment with U.S. standards and strengthens long-range precision-strike options amid growing Indo-Pacific tensions. The GBU-39/B, a 113-kg GPS/INS-guided weapon, provides all-weather precision and was originally developed to allow aircraft to carry multiple precision munitions without aerodynamic penalties. Boeing began production in 2003, with operational entry in 2006. Up to four SDBs can be mounted on a single weapons station using a dedicated Bomb Rack Unit, significantly boosting combat loadouts. Its relatively low unit cost supports high-volume acquisition—an important factor for allied air forces balancing readiness and budget constraints.
