L3Harris tests new advanced rocket motor in U.S. Missile Defense Agency exercise

By Defence Industry Europe

The U.S. Missile Defense Agency (MDA), in partnership with the U.S. Navy, has successfully completed Flight Test Other-40 (FTX-40), also known as Stellar Banshee. Conducted on 24 March 2025 off the coast of Kauai, Hawaii, the test marks a significant milestone in efforts to counter emerging hypersonic threats.
Photo: Missile Defense Agency.

L3Harris Technologies has introduced a new large solid rocket motor, the eSR-19, which successfully powered a recent U.S. Missile Defense Agency (MDA) test. The rocket motor supported the first and second stages of an air-launched Medium Range Ballistic Missile (MRBM) during a test mission known as Flight Test Other-40, or Stellar Banshee.

 

The exercise aimed to evaluate the detection and tracking capabilities of advanced hypersonic threats, with the USS Pinckney playing a key role. It also involved a simulated launch of an upgraded Standard Missile 6 at the MRBM, which featured a Hypersonic Target Vehicle 1.

L3Harris described the eSR-19 as an enhanced version of the legacy SR-19 motor used in the second stage of Minuteman III strategic missiles. The upgraded motor includes a lighter filament-wound composite casing and other technical improvements to boost performance.

 

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“L3Harris designs, builds and integrates air-launched target missiles and then launches them from C-17 aircraft to provide realistic test trajectories,” said Ken Bedingfield, President of Aerojet Rocketdyne, L3Harris. “The enhanced capability of our new eSR-19 solid rocket motor, combined with our proven air-launch system, allows our target missile to accurately represent a wider array of potential threats, providing MDA with more flexibility in developing test scenarios.”

 

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