Photo By Capt. Zemas Andargachew | A Skyhammer effector is positioned to validate basic flight control and performance during a ‘Project Bullfrog’ exercise, Mar. 26, 2026, at an undisclosed location in Europe. This event was part of the first system-level testing campaign for Cambridge Aerospace, the producer of the Skyhammer effector, and the 52nd Air Defense Artillery Brigade, which spearheads the ‘Project Bullfrog’ series of exercises aimed at accelerating the development of layered air and missile defense solutions for the U.S. Army (Courtesy photo by Mr. Daniel Ringrose). see less
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‘Project Bullfrog’ sees Army Air Defenders in Europe assess Skyhammer effector
SEMBACH, Germany – The ‘Project Bullfrog’ series of exercises, driven by the 52nd Air Defense Artillery Brigade (52d ADA BDE), brings together servicemembers and innovative air defense solutions from industry. During a recent iteration, the Skyhammer effector, produced by Cambridge Aerospace, underwent testing, marking another step in the brigade’s ongoing effort to accelerate the development of layered air and missile defense solutions for the U.S. Army.
The developmental tests focused on evaluating Skyhammer’s potential contribution to the Eastern Flank Deterrence Initiative (EFDI), the transformational warfighting concept that leverages unmanned and minimally manned systems, backed by an integrated mission command network that uses live data to accelerate decision-making and offset forward posture and adversary advantages in mass and momentum. The EFDI is spearheaded by the vision of the United States Army Europe and Africa (USAREUR-AF) and NATO Allied Land Command (LANDCOM).
The events provided Soldiers, engineers, and operational planners with an opportunity to assess the system’s performance, integration potential, employment considerations, and suitability for further operational evaluation. Following the developmental test series, the U.S. Army’s Global Tactical Edge Acquisition Directorate (G-TEAD) is expected to invite Cambridge Aerospace for an Operational Assessment and potential fielding consideration.
“The threat is adapting quickly, and our formations must move with the same urgency,” said Capt. Kurt Blumeyer, 52d ADA BDE’s Weapons Evaluation Test Cell Officer. “These tests allowed Soldiers and developers to work side by side, identify operational requirements, and evaluate whether emerging technology can help close real gaps in the current defense design,” Blumeyer continued.
The 52d ADA BDE remains committed to rapidly identifying, testing, and integrating capabilities that strengthen air defense in depth, protect critical assets, and give commanders more options to counter evolving aerial threats. Expanding its portfolio, the brigade is also working to defeat the cost curve for counter-cruise-missile capabilities, collaborating with Cambridge Aerospace on the Starhammer, a low-cost cruise missile with defeat capability.
“Along with increasing magazine depth amongst c-UAS capabilities, we are looking to do the same in the counter cruise missile space, at a low cost, to augment our exquisite interceptors,” said Maj. Cody Davis, the 52d ADA BDE Operations Officer. “Currently, we are planning to integrate the StarHammer into existing joint-force and European multinational exercises,” Davis continued.
These efforts reflect the brigade’s broader approach to air defense modernization: identifying operational problems from forward-deployed units, pairing them with promising industry solutions, and using Soldier-informed testing to determine whether systems are ready for further evaluation, refinement, or fielding.
The Skyhammer effector is designed as a lower-cost interceptor option to support layered defense against various aerial threats. During the test series, 52d ADA BDE personnel examined how the system could enhance depth, magazine capacity and engagement options within a broader integrated air and missile defense architecture.
“This partnership with the 52nd Air Defense Artillery Brigade allowed us to put Skyhammer in front of Soldiers who understand the threat and the mission,” said Chris Sylvan, Chief Commercial Officer and co-founder of Cambridge Aerospace. “Their feedback was direct, operationally grounded, and invaluable as we continue refining the system for real-world use,” Sylvan added.
The brigade emphasized that developmental testing does not constitute a final procurement or fielding decision. Instead, it provides commanders and technical stakeholders with the data needed to determine whether a system should proceed to operational assessment.
The planned operational assessment will take place this summer and provide a more rigorous venue for evaluating Skyhammer in an environment relevant to current and future ground-based air defense operations. The assessment is expected to inform future decisions on potential employment, integration, and fielding pathways.
The 52d ADA BDE provides air and missile defense capabilities in support of USAEUR-AF. The brigade focuses on defending critical assets, protecting maneuver forces, and advancing integrated air defense capabilities across the European and African theaters
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