The US Department of State has approved a potential Foreign Military Sale (FMS) to the Government of Denmark for AGM-158B Joint Air-to-Surface Standoff Missiles with Extended Range (JASSM-ER) and related equipment, signaling a significant enhancement of the Royal Danish Air Force’s (RDAF) long-range precision-strike capabilities. The Defense Security Cooperation Agency (DSCA) delivered the required certification notifying Congress of the possible sale today. Under the proposed agreement, Denmark has requested the procurement of the stealthy, conventional air-launched cruise missiles alongside operational, logistical, and technical support services. According to the State Department, the sale will support US foreign policy and national security objectives by improving the security of a NATO ally, bolstering regional stability, and enhancing interoperability with US and coalition forces.
Developed by Lockheed Martin, the AGM-158B JASSM-ER is a low-observable standoff weapon designed to penetrate highly contested integrated air defense systems (IADS). The missile features a 1,000-pound (450 kg) class armor-piercing warhead optimized for destroying high-value, hardened, and fixed targets from deep standoff ranges. The JASSM-ER maintains 70% hardware commonality and 95% software commonality with the baseline AGM-158A JASSM, utilizing the same external dimensions. However, it incorporates a highly efficient turbofan engine and expanded internal fuel capacity to achieve an operational range exceeding 575 miles (925 km), compared to the baseline variant’s 230-mile (370 km) reach.
The baseline AGM-158A entered service with the US Air Force (USAF) in 2009, concluding its procurement cycle with Lot 16 in 2021. The extended-range AGM-158B entered service in April 2014, with full-rate production authorized in December of that year. While originally validated on the USAF B-1B Lancer bomber, the JASSM-ER has since been integrated across multiple platforms, including the B-52H, B-2 Spirit, F-15E Strike Eagle, and F-16 Fighting Falcon. It is also deployed by the US Navy on F/A-18E/F Super Hornets and F-35C Lightning II fighters. For the RDAF, the acquisition aligns with its ongoing transition to the F-35A Lightning II. Due to the physical dimensions of the missile, the F-35 cannot accommodate the JASSM-ER within its internal weapons bays.
Consequently, integration will require external carriage, which increases the aircraft’s radar cross-section (RCS) and compromises its low-observable characteristics during transport. The proposed sale comes amid continuous structural upgrades to the JASSM production line. Lockheed Martin is currently delivering the AGM-158B-2 variant under Lot 19 contracts initiated in 2021. This model features a reconstructed wing assembly, an upgraded missile control unit, rewritten software architecture in C++, an electronic safe-and-arm fuze, and an enhanced secure GPS receiver. Future iterations include the AGM-158B-3, featuring Military Code (M-Code) GPS capabilities, and the AGM-158D, which is set to incorporate a Line-of-Sight/Beyond-Line-of-Sight (LOS/BLOS) Weapon Data Link (WDL) for post-launch retargeting. If finalized, Denmark will join a growing roster of international JASSM operators, which includes Australia, Finland, and Poland.
