The GBU-53/B StormBreaker, previously known as the Small Diameter Bomb II (SDB II), is an American air-launched, precision-guided glide bomb (Smart Weapon). The StormBreaker smart weapon weighs just over 200 pounds, and up to 20 can fit on fighter jets like the F-15E Strike Eagle. But their warheads, equipped with shape charge jets, fragmentation and blast charge effects, and an option for a delayed smart fuze, are powerful enough to defeat tanks. In July 2018, Raytheon announced that the SDB II, recently renamed StormBreaker, had entered operational testing; the weapon had achieved a 90% success rate during developmental testing. The U.S.Air Force planned to declare the SDB II operational in September 2019, but a problem with the bomb’s backup fin storage clips, other hardware and software issues, and the COVID-19 pandemic delayed its introduction. The StormBreaker was approved for operational use onboard the F-15E in September 2020.
The StormBreaker smart weapon has a tri-mode seeker – that uses imaging infrared and millimeter wave radar – to see through fog, smoke and rain as it glides over 45 miles to strike both fixed or moving targets on land or at sea. The system can also use its semi-active laser or GPS guidance to hit targets. It’s engineered with the flexibility to engage a variety of threats in any environment. Another key benefit of the StormBreaker system is its networking capabilities. This means one platform could launch it but hand off controls to another. That will be an important capability as the U.S. military aims to connect sensors, platforms and weapon systems across the traditional domains of land, air, sea and space. Raytheon Missiles & Defense used digital technologies – both tools and processes – to develop StormBreaker. To verify system performance, the team uses an integrated flight simulation, or IFS, and literally runs thousands of iterations in tandem with the Air Force using data from testing to continuously improve simulation accuracy.
“It packs a big punch. The multi-effects warhead really separates this air-to-surface weapon from its predecessor and other munitions in its class. There’s more possible for StormBreaker – options like adding propulsion or swapping out the seeker depending on the mission. The hardware and software can cover a range of threats. It’s a very flexible weapon – one-of-kind with world class technology. It’s inherent with this weapon and absolutely critical going into a more connected – JADC2 (Joint All Domain Command and Control) – battlespace environment. It’s certainly an advanced weapon in terms of its design and development and how we’re architecting it for the future. It’s extremely capable now and we’re just getting started,” said Alison Howlett, program director for StormBreaker smart weapon at Raytheon Missiles & Defense, a Raytheon Technologies business.
In 2020, the U.S. Air Force cleared the system for use on the F-15E, making it the first aircraft to carry the weapon. After achieving this milestone, the Air Force and Raytheon Missiles & Defense dropped 14 StormBreaker smart weapons in the 2021 Weapons System Evaluation Program. The successful evaluation and tactics development paves the way for its use by combat air forces. The F-15E can carry five groups of four StormBreaker smart weapons, for a total of 20 munitions. Depending on the mission, the F-15EX Strike Eagle II can carry more than 16 StormBreaker weapons. The F/A-18E/F Super Hornet will be the second fighter jet to add the weapon when it reaches initial operating capability. Raytheon Missiles & Defense is integrating the StormBreaker weapon on the F-35 Joint Strike Fighter. The first-ever StormBreaker munition drop test from an F-35 was conducted in late 2021 to test the communication link between the weapon and a secondary aircraft.