US Army Adapts 30mm Proximity-Fuzed Ammunition for Counter-UAS Engagement from Existing Platforms
Expensive guided missiles against cheap commercial drones is widely framed as a cost problem requiring new systems — but the US Army’s Ammunition and Energetics programme is demonstrating that the solution may lie in adapting existing 30mm proximity-fuzed rounds already in the inventory, transforming the Bradley IFV and Apache from armour-centric platforms into counter-UAS assets without hardware modification.
Technical Summary
The US Army Capability Programme Executive for Ammunition and Energetics, operating through the Maneuver Ammunition Systems office, is advancing a programme to equip existing combat platforms with proximity-fuzed 30mm ammunition capable of engaging small Unmanned Aircraft Systems (sUAS). The initiative addresses the widely acknowledged cost asymmetry in which guided missiles costing USD 500,000–3,000,000 per round are employed against commercially derived drones costing USD 500–5,000.
The programme centres on two parallel development lines in the 30mm calibre family. For ground vehicle platforms, the XM1211 High Explosive Proximity (HEP) round, chambered in 30×173mm for the MK44 Bushmaster II chain gun on Stryker Infantry Carrier Vehicles (ICVs), incorporates a proximity sensor into the fuze assembly while retaining self-destruct capability. For aviation platforms, the XM1225 Aviation Proximity Explosive (APEX) round, chambered in 30×113mm for the M230 Area Weapon System on the AH-64 Apache, completed its first air-to-air live-fire engagement against UAS targets at Yuma Proving Ground, Arizona, in December 2025.
Kaitlyn Tani, Deputy Project Manager for Maneuver Ammunition Systems, confirmed: “We’re taking your Bradley fighting vehicle and [making it] counter-UAS capable.” Col. Vinson Morris, Project Manager for Close Combat Systems, added: “We’re definitely looking at all of our legacy munitions” for counter-UAS adaptation, including Mk-19 grenade launcher rounds and mortar ammunition.
Analysis of Effects
Proximity Fuze Technology
The proximity fuze represents the critical enabling technology for medium-calibre counter-UAS engagement. Unlike point-detonating (PD) fuzes that require direct impact with the target — a low-probability event against small, manoeuvring UAS — proximity fuzing allows the round to detonate when its sensor detects the target within a pre-set distance. The resulting fragmentation and blast envelope compensates for fire control errors and target movement, significantly increasing the probability of kill (Pk) against sUAS targets.
The XM1211 HEP combines proximity sensing with a standard self-destruct backup, ensuring the round detonates before returning to ground if no target is detected. This is an essential safety feature for employment over friendly-held terrain. The more advanced XM1223 Multi-Mode Proximity Airburst (MMPA) round, also in development, combines the anti-armour capability of the XM1198 High Explosive Dual Purpose with Self-Destruct (HEDP-SD) with the proximity airburst function, creating a single round capable of both traditional ground targets and airborne UAS.
30mm Counter-UAS Ammunition Family
XM1211 HEP (Ground): 30×173mm, proximity + self-destruct fuze, MK44 Bushmaster II platform (Stryker ICV)
XM1225 APEX (Aviation): 30×113mm, proximity fuze, M230 chain gun platform (AH-64 Apache)
XM1223 MMPA (Multi-Mode): 30×173mm, combined HEDP + proximity airburst, future multi-role round
Hazard Division: HD 1.2 (assessed; proximity fuze electronics may affect classification)
Key Advantage: No platform hardware modification required — ammunition-only upgrade
WOME Storage and Logistics Implications
The introduction of proximity-fuzed rounds into existing ammunition supply chains raises several considerations for WOME professionals. Rounds containing active electronic components (the proximity sensor and its power supply) may require different storage classification under AASTP-1 than their conventional PD equivalents. The electronic fuze assembly includes a battery that activates on firing; pre-activation through extreme temperature, electromagnetic interference, or mechanical shock during storage must be addressed in the hazard assessment.
Additionally, the proliferation of multiple 30mm round types in the same calibre (PD, HEP, HEDP-SD, MMPA) increases the risk of munition misidentification during combat logistics operations. Distinct colour coding and marking schemes under MIL-STD-709 are essential for preventing incorrect round selection during ammunition upload.
Personnel and Safety Considerations
The operational proof of concept from Yuma Proving Ground — where the Apache successfully engaged UAS targets with 30mm proximity ammunition at various ranges — establishes that medium-calibre kinetic engagement of sUAS is technically viable. For UK WOME professionals, this development has direct relevance to any future adaptation of the 30mm L21A1 RARDEN cannon ammunition family or its successor systems for counter-UAS roles.
Current NATO standards (STANAG 4586 for UAS interoperability, STANAG 4569 for vehicle protection) do not specifically address counter-UAS ammunition classification. As proximity-fuzed medium-calibre rounds enter wider NATO service, CASG (AC/326) Sub-Group B (Munitions Systems Safety) will need to establish safety assessment criteria for electronically-fuzed rounds in the 20–40mm calibre range.
Data Gaps
DATA GAP: NEQ for proximity-fuzed rounds — The HE fill mass for the XM1211, XM1223, and XM1225 has not been published. NEQ is required for storage QD calculations and transport classification.
DATA GAP: Electronic fuze ESD sensitivity — Whether the proximity sensor electronics introduce additional electrostatic discharge sensitivity during handling and storage has not been addressed in open-source reporting.
DATA GAP: Programme timeline and fielding date — No Initial Operating Capability (IOC) or Full Operational Capability (FOC) dates have been announced for any of the three round types.
DATA GAP: Pk data — Probability of kill against representative sUAS target sets at various ranges and engagement geometries has not been published from the Yuma Proving Ground trials.
Authoritative References & Evidential Record
- 1. Defense One — “The Army wants to use bullets, mortars, and artillery to take out small drones,” March 2026. [Link] [B/2]
Primary reporting on the Ammunition and Energetics programme, including quotes from Tani and Morris. - 2. DVIDS — “Built to Hunt: Apache attack helicopter’s new 30mm proximity ammunition,” 2026. [Link] [A/2]
Official DoD source confirming XM1225 APEX designation and Yuma Proving Ground live-fire results. - 3. Task and Purpose — “The Army is eying a new all-in-one proximity round for its 30mm chain guns,” 2025. [Link] [B/2]
Technical detail on XM1223 MMPA multi-mode round and its relationship to XM1198 HEDP-SD and XM1211 HEP. - 4. NATO STANAG 4439 / AOP-39 — Policy for Introduction, Assessment, and Testing for Insensitive Munitions. [A/1]
Referenced for IM assessment requirements applicable to new fuze designs.
Corrections & updates welcome. If you hold open-source data that refines or corrects any parameter in this article, please contact [email protected] citing the specific claim and your source. Verified corrections will be incorporated and credited in the revision history.