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// DOSSIER — us-air-force-search-ground-based-medium-caliber
U.S. Air Force Initiates Search for Ground-Based Medium-Caliber Air Defense Systems
REL_TIME: 10 Sep 2026 05:12Z · LANG: EN
In response to recent combat losses and damage to overseas installations caused by Iranian-led drone and cruise missile attacks, the U.S. Air Force has launched a market research initiative to acquire a portable, medium-caliber gun-based air defense system. This project aims to establish an organic, cost-effective inner layer of defense to protect air bases, thereby preserving high-end, expensive missile interceptors for priority threats and enhancing resilience against saturation attacks.
// Background
The U.S. military has faced significant challenges in the Middle East throughout 2026, with Iranian forces utilizing low-cost one-way attack drones and cruise missiles to bypass traditional air defenses. These attacks have caused casualties and equipment damage, highlighting a critical vulnerability in base protection and the unsustainable cost of using high-end interceptors (like the Patriot system) against inexpensive aerial threats. The Air Force is now seeking to bridge this gap by adopting gun-based systems similar to those successfully utilized by Ukraine, such as the German-made Gepard.
// Key Developments
- The Air Force issued a Request for Information (RFI) for a 'Ground-Based, Medium-Caliber Gun Weapon System' with a submission deadline of October 9, 2026.
- The initiative is driven by recent combat experience in the Middle East, where Iranian drone and missile strikes resulted in U.S. troop casualties and damage to aircraft, including five KC-135s.
- The system must be lightweight, modular, and transportable to support rapid deployment to austere environments.
- The Air Force seeks to optimize the cost-per-engagement ratio, moving away from reliance on high-cost interceptors for low-cost threats like small drones.
- Potential solutions include systems such as Rheinmetall’s Skyranger 35 and Skynex, and Northrop Grumman’s Raid Hunter 50mm chain gun system.
- The project represents a strategic shift for the Air Force to develop organic ground-based air defense capabilities, a role traditionally managed by the U.S. Army.
// Timeline
-
Iranian missile and drone attack targets U.S. Navy Fifth Fleet headquarters in Bahrain.
-
Air Force Secretary Troy E. Meink testifies to Congress on the need for organic air and missile defense capabilities.
-
U.S. Army publishes a 'Sources Sought' notice for a 50mm anti-drone cannon.
-
Air Force Life Cycle Management Center publishes the RFI for the Ground-Based, Medium-Caliber Gun Weapon System.
-
Deadline for industry responses to the Air Force RFI.
// Perspectives
[U.S. Air Force]
Prioritizing the development of organic, cost-effective, and portable air defense to protect assets from saturation attacks.
[Defense Industry (e.g., Northrop Grumman, Rheinmetall)]
Actively promoting medium-caliber gun systems and programmable ammunition as mature, efficient solutions for modern drone and cruise missile threats.
[U.S. Army]
Collaborating on similar requirements for 50mm anti-drone cannons, reflecting a broader military-wide effort to address short-range air defense gaps.
// Quotes
“The Government is conducting market research to identify potential industry sources capable of providing solutions for a Ground-Based, Medium-Caliber Gun Weapon System that fires affordable munitions.”
“The fielding of the Air Base Air Defense Systems (ABADS) missile defense capability, including kinetic defenses, at overseas main operation bases contributes to joint layered defense but does not reduce the need for increased joint investment.”
