The United States has approved a potential US$111.8 million Foreign Military Sale that would add 624 GBU-39B Small Diameter Bombs to South Korea’s precision strike inventory, according to the Defense Security Cooperation Agency. The deal comes as tensions in Northeast Asia continue to rise and as Washington and Seoul deepen interoperability across long-range air warfare missions.
The latest request follows a previous South Korean procurement effort that stayed below the Congressional notification threshold, bringing Seoul’s prospective total inventory of GBU-39 variants to more than 1,000 rounds once all tranches are completed. South Korean officials say the new weapons will align the Republic of Korea Air Force with U.S. strike standards and expand target options for F-15K and F-35A squadrons assigned to Indo-Pacific missions.
The GBU-39/B Small Diameter Bomb is a 250-pound-class guided munition combining GPS and inertial navigation, capable of high-accuracy engagement in all weather and day-night conditions. Developed in response to a late-1990s requirement for compact precision weapons, the program accelerated after 2001 with Boeing selected as the prime contractor. The SDB initially entered U.S. Air Force service in 2006 and is now widely fielded across allied air fleets.
Each aircraft can carry up to four SDBs per station using a dedicated Bomb Rack Unit based on the MIL-STD-1760 interface, enabling fighters to increase mission effects without aerodynamic penalties. With a reported unit cost of roughly US$40,000, the weapon remains affordable for large-scale procurement and attractive to U.S. partners seeking economical precision strike capacity against hardened or high-value targets.
