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Bell Completes Critical Design Review for DARPA SPRINT X-76 Aircraft

Bell Textron finishes Critical Design Review for DARPA’s SPRINT program, advancing the X-76 aircraft to the build phase with runway-independent, high-speed VTOL capabilities.

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This article is based on an official press release from Bell Textron Inc.

Bell Textron Inc. has successfully completed the Critical Design Review (CDR) for the Defense Advanced Research Projects Agency (DARPA) SPeed and Runway INdependent Technologies (SPRINT) program. According to a company press release, this major developmental milestone clears the path for Bell to begin manufacturing its next-generation aircraft demonstrator.

The experimental aircraft has officially received the military designation of X-76. Jointly funded by DARPA and the U.S. Special Operations Command, the SPRINT initiative is designed to pioneer advanced, runway-independent aviation technologies that can eventually be scaled across various military platforms.

By passing the CDR phase, Bell transitions from conceptual engineering to the physical construction of the X-76, marking a significant step forward in high-speed vertical lift capabilities.

Advancing the X-76 Demonstrator

Transitioning to the Build Phase

In July 2025, Bell announced it had been down-selected for Phase 2 of the SPRINT program. Following the successful completion of the Critical Design Review, the company is now authorized to proceed with building the X-76 demonstrator.

“Following the completion of CDR, Bell will now begin building a brand-new X-plane with first-of-its-kind stop/fold technology.”

As stated in the official release, this innovative design approach is intended to blend the vertical takeoff and landing (VTOL) flexibility of a helicopter with the high-speed cruise performance of a fixed-wing aircraft. During Phase 1A and Phase 1B of the program, Bell finalized the conceptual and preliminary design efforts that laid the groundwork for the current build phase.

SPRINT Program Goals and Capabilities

Speed and Runway Independence

The primary objective of the SPRINT program is to develop an aircraft capable of operating without traditional runway infrastructure while maintaining high-speed forward flight. The press release notes that the X-76 is being designed to achieve cruise speeds ranging from 400 to 450 knots at relevant altitudes.

Furthermore, the aircraft must be able to hover in austere environments and operate from unprepared surfaces. These capabilities are highly sought after by the U.S. Special Operations Command to ensure rapid, flexible deployment in contested or remote operational theaters. The technologies validated by the X-76 demonstrator are intended to be scalable to different military-aircraft in the future.

Risk Reduction and Legacy

Testing and Validation

To prepare for the physical development of the X-76, Bell completed a series of rigorous risk reduction activities. The company successfully demonstrated its folding rotor, integrated propulsion, and flight control technologies at Holloman Air Force Base. Additionally, Bell conducted extensive wind tunnel testing at the National Institute for Aviation Research (NIAR) at Wichita State University.

The X-76 adds to Bell’s extensive 90-year history of experimental aircraft development. The company has previously pioneered innovative VTOL configurations for NASA, the U.S. Army, and the U.S. Air Force, including the X-14, X-22, XV-3, and XV-15, building upon the historic legacy of the Bell X-1.

AirPro News analysis

At AirPro News, we view the official designation of the X-76 and the transition to the build phase as a strong indicator of the Department of Defense’s commitment to next-generation vertical lift. We note that the requirement to cruise at 400 to 450 knots significantly exceeds the top speeds of conventional helicopters and current tiltrotor aircraft. Successfully demonstrating stop/fold rotor technology in flight will represent a major leap in aerospace engineering, potentially reshaping how special operations and tactical transport missions are executed in environments where traditional runways are unavailable or compromised.

Frequently Asked Questions

What is the X-76?

The X-76 is the official military designation for the next-generation aircraft demonstrator being built by Bell Textron Inc. for the DARPA SPRINT program.

What does SPRINT stand for?

SPRINT stands for SPeed and Runway INdependent Technologies, a joint aviation development program funded by DARPA and the U.S. Special Operations Command.

How fast will the X-76 fly?

According to the program’s official goals, the X-76 is designed to cruise at speeds between 400 and 450 knots at relevant altitudes.

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Photo Credit: Bell

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Defense & Military

Hermeus Selects Anduril Lattice for Quarterhorse Mk 2

Hermeus partners with Anduril to integrate Lattice autonomy software into the Mach 3 Quarterhorse Mk 2, targeting autonomous flight in 2027.

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Hermeus has selected Anduril Industries to integrate the Lattice for Mission Autonomy software into the Quarterhorse Mk 2 high-speed uncrewed aircraft, marking Anduril’s first commercial agreement to supply its autonomy solution for a third-party Group 5 platform.

Announced in a joint press release on September 3, 2026, the partnership aims to achieve the first autonomous flight of the Quarterhorse Mk 2 in 2027. The integration aligns with the United States Air Force (USAF) Collaborative Combat Aircraft (CCA) program’s push for modular systems, demonstrating that advanced hardware and software can be developed independently and combined for high-Mach environments.

Advancing high-Mach autonomous capabilities

The Quarterhorse program, supported by funding from the Pentagon’s Defense Innovation Unit (DIU), targets speeds of Mach 3. Hermeus has maintained an aggressive development timeline, flying its first aircraft in 2025 and reaching supersonic speeds with the Quarterhorse Mk 2.1 exactly 364 days later. The company is currently preparing to fly the Mk 2.2 variant, which was constructed in under a year.

Anduril’s Lattice Software will serve as the core mission planning and execution engine for the Mk 2. Operators will interface with the aircraft using Anduril’s Menace-T command, control, communications, and computing (C4) solution. This system is already utilized by USAF operators to generate sorties with semi-autonomous aircraft.

Speaking to Breaking Defense, Hermeus Chief Executive Officer Zach Shore explained the operational necessity of the Partnerships and the need for scalable command-and-control systems.

“We now need to automate a lot of those flight controls. I want to be able to push a button, have the aircraft spin up, have the aircraft auto takeoff, all those basic features that allow one person to manage multiple platforms,” Shore told the publication.

Validating modular architecture for the CCA program

The agreement serves as a practical application of the Autonomy Government Reference Architecture (A-GRA) standard. By separating the airframe development from the autonomy software, the partnership mirrors the acquisition strategy of the USAF CCA program.

Anduril noted in its September 3 press release that the Hermeus contract validates this focus on modularity. Establishing a common standard ensures cross-compatibility between disparate hardware and software systems, which the company states will accelerate the deployment of autonomous Military-Aircraft.

Brett Darcey, Anduril’s General Manager and Vice President for Mission Autonomy in Air Dominance and Strike, emphasized the maturity of the integration in comments to Breaking Defense.

“We really want to emphasize the fullness of the stack. This isn’t just a mission autonomy science project. This is really readying the Quarterhorse for [autonomous operations],” Darcey stated.

AirPro News analysis

We view this integration as a critical test case for the Pentagon’s broader uncrewed Aviation strategy. If Anduril’s Lattice can successfully manage a third-party airframe operating at Mach 3, it will prove that the A-GRA standard is viable for extreme flight envelopes, not just subsonic loyal wingman platforms. The 2027 flight test will be a major milestone for both companies, potentially opening the door for Anduril to market its autonomy stack to other aerospace Manufacturers while allowing Hermeus to focus entirely on its high-speed propulsion and aerodynamic challenges.

Sources: Anduril Industries

Photo Credit: Anduril Industries

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Defense & Military

MAFFS Surpasses One Million Gallons in 2026 Fire Season

Military MAFFS crews delivered over 1.07M gallons of fire retardant by Aug 31, 2026, exceeding the totals of the previous two years.

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Military-Aircraft aircrews operating the Modular Airborne Fire Fighting System (MAFFS) surpassed one million gallons of fire retardant delivered across the western United States on August 28, 2026, underscoring the severity of a wildfire season that has already eclipsed the total aerial firefighting volumes of the previous two years.

According to an official release from the U.S. National Guard on September 2, 2026, the running total of retardant dropped by MAFFS-equipped Lockheed C-130 Hercules aircraft reached 1,070,017 gallons by August 31. The program provides critical surge capacity for the U.S. Forest Service (USFS) and the National Interagency Fire Center (NIFC) when commercial and federal contract airtankers are fully committed to existing incidents.

Surge capacity in a demanding fire season

The 2026 season ranks among the busiest of the past decade for military aerial firefighting units. The current volume of 1,070,017 gallons significantly exceeds the 410,810 gallons delivered in all of 2025 and the 871,205 gallons dropped in 2024.

While 2026 has seen elevated activity, the busiest MAFFS season of the past decade remains 2021, which saw 2,583,204 gallons delivered, followed by 1,350,298 gallons in 2020. With weeks potentially remaining in the current fire season, the final 2026 figures are expected to climb further.

Col. Jason Little, Commander of the MAFFS Air Expeditionary Group, emphasized the program’s role in supporting civilian agencies during periods of high demand.

“We serve as a surge capability, and our responsibility is to be as prepared and effective as possible when called upon,” Little stated. “We do our best to integrate seamlessly with the federal and state agencies committed to wildland firefighting.”

Multi-unit military coordination

The MAFFS mission requires coordination across multiple military branches and state lines. Operations for the 2026 season are being coordinated from Reno, Nevada, drawing on resources from across the western United States.

The effort comprises crews from the 146th Airlift Wing of the California Air National Guard, the 152nd Airlift Wing of the Nevada Air National Guard, the 153rd Airlift Wing of the Wyoming Air National Guard, and the 302nd Airlift Wing of the Air Force Reserve Command based in Colorado. These units operate C-130 aircraft fitted with specialized MAFFS roll-on/roll-off equipment, allowing standard tactical airlifters to function temporarily as heavy airtankers.

AirPro News analysis

The rapid accumulation of MAFFS flight hours and retardant drops in 2026 highlights a growing reliance on military surge capabilities to manage domestic natural disasters. As commercial airtanker fleets face high utilization rates early in the fire season, the strategic value of the MAFFS program becomes increasingly apparent. We note that the year-over-year volatility in retardant volumes, fluctuating from just over 410,000 gallons in 2025 to over a million before September in 2026, presents ongoing readiness and funding challenges for the participating Air National Guard and Air Force Reserve units. These squadrons must balance unpredictable domestic support missions with their primary military readiness and global airlift requirements.

Sources: U.S. National Guard

Photo Credit: Senior Master Sgt. Paula Macomber

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Defense & Military

South Carolina Guard Fields First HH-60M Black Hawk

South Carolina Army National Guard takes delivery of the first HH-60M Black Hawk at McEntire JNGB, upgrading medevac capabilities.

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The South Carolina Army National Guard took delivery of the first of three new HH-60M Black Hawk helicopters on August 27, 2026, marking a significant modernization of the unit’s medical evacuation and disaster response capabilities.

In a press release issued on September 1, 2026, the U.S. Army announced the arrival of the military-aircraft at McEntire Joint National Guard Base in Eastover, South Carolina. The delivery to the 59th Aviation Troop Command and Army Aviation Support Facility 1 (AASF1) continues a four-decade legacy for the state, which was the first in the Army National Guard to field the original UH-60A Black Hawk in October 1986.

Upgraded capabilities for life-saving missions

The HH-60M is a specialized variant of the Sikorsky Black Hawk platform designed specifically for medical evacuation operations. The new aircraft features a digital glass cockpit, upgraded engines, advanced composite rotor blades, and integrated aircraft health-monitoring systems.

These technical enhancements replace older airframes and provide crews with better tools for domestic emergencies and search and rescue operations. Maj. Stephen Johnson, commander of AASF1, noted the operational benefits of the new platform.

“The modern avionics and navigation systems provide our crews with greater situational awareness when transporting patients, medical personnel, and specialized equipment. The improved power and rotor systems give us enhanced performance, which is crucial for our life-saving missions.”

Transition and historical legacy

Preparing for the HH-60M required extensive logistical and training updates at the Eastover facility. The transition involves maintainers, pilots, and crew chiefs adapting to the modernized avionics and maintenance requirements of the M-model Black Hawk.

Johnson credited the facility staff for their work behind the scenes to prepare the logistics and training pipelines for the transition. The South Carolina National Guard has a long history with the Black Hawk family, having transitioned from the Vietnam-era UH-1 Huey to the UH-60A in 1986.

AirPro News analysis

The fielding of the HH-60M to National Guard units underscores the dual-role nature of these aviation assets. While they maintain readiness for federal deployments, their primary day-to-day utility often lies in state-level disaster response. As we observe the ongoing modernization of Guard aviation units, the shift to digital cockpits and enhanced lift capabilities directly translates to safer operations during adverse weather and complex domestic rescue missions.

Sources: U.S. Army

Photo Credit: US Army – Sgt. Ana-Grace Catoe

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