In a significant leap forward for battlefield medicine, the U.S. Army’s 173rd Airborne Brigade has begun using drones to deliver blood supplies directly to the frontlines during training exercises.

The approach, tested in last month’s Swift Response 2025 exercise across the Baltic and Arctic regions, dramatically reduced transport times and lowered the risks to personnel.

“The difference is someone dying and someone not, because four minutes is substantially faster than 20 or 30,” said 1st Sgt. Cyril Clayton, a senior medic with the 173rd Brigade.

“As far as risk to the force goes, we’ve cut it from probably five to two.”

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Traditionally, delivering blood and other medical resources involved field ambulances or helicopters, requiring multiple personnel and placing them in harm’s way.

In the Lithuania-based exercise, medics needed to transport blood three to four kilometers—a task that previously consumed 20 to 30 minutes and up to five soldiers. But with drones, delivery took just four minutes, reshaping how care can be administered in future conflicts.

The shift comes as the Army prepares for large-scale warfare, where medical evacuation may not always be possible. Blood loss is a major killer on the battlefield, accounting for up to 80% of potentially survivable deaths.

Using drones to move blood, therefore, isn’t just a matter of convenience—it’s a strategy that could save lives in high-casualty scenarios.

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“The force of drone movement on human tissues is about as good as we can do prior to actual humans,” said Maj. David Hourani, a brigade surgeon, highlighting that drone delivery mimics real-world handling conditions and preserves the quality of blood products.

Still, the mission wasn’t without its challenges. Army medics must maintain strict control over blood temperature using ice to keep the components viable. During a previous exercise—Saber Junction—line medics parachuted with blood, a technique later deemed unsuitable due to G-forces and cooling complications.

“There’s definitely a limited shelf life on how long we can keep units,” Clayton explained. “The requirements for ice are heavy... and anytime you’re going to jump something under canopy, that’s a concern.”

Blood cells are fragile, and high-impact movements can rupture their outer membranes, rendering them useless for transfusion. “Each of those cells in that bag is potentially life-saving,” Clayton emphasized.

“Any force outside of normal parameters could potentially damage those cells... and then they’re no longer viable for resuscitation.”

During the exercise, technicians packed 18 units of whole blood—enough to treat approximately five casualties—into Collins Boxes, insulated containers designed for medical transport.

These were loaded onto drones at the main command post and flown to field hospitals. After delivery, the drones returned for resupply, completing multiple missions across short and mid-range distances.

“In an actual combat theater, it could be 20-30 [kilometers],” said Clayton. “I don’t think there would be any issues with temperature for that amount of time. The biggest thing is going to be the navigation piece.”

One of the key takeaways from Swift Response 2025 was the logistical support needed for sustained drone operations.

Drones required dedicated tents, generators, and viewing stations to operate continuously. Another issue was airspace deconfliction—ensuring drones and traditional aircraft like helicopters didn’t collide.

“If a helicopter is coming in low, the drones are grounded,” said Capt. Jessica Knoll, commander of the brigade’s support medical company. “Whereas if the helicopter is maintaining airspace above 500 feet, drones are good to fly at 100-200 feet.”

Looking ahead, the Army is expanding its drone capabilities across its formations.

While infantry and artillery units may use drones for reconnaissance or attack, medics are bound by the Geneva Convention, limiting their drones strictly to defensive and humanitarian tasks.

“Our concerns are making sure that we’re using the drones defensively and not offensively,” Knoll said. “Ultimately to render aid to service members in need and not for defense.”

The 173rd tested Class II drones, including the TRV 150 cargo drone and the FlyingBasket, capable of carrying up to 220 pounds. Both have flight ranges capped by battery life and communication limits—roughly 30 minutes and five kilometers, respectively. Still, Knoll sees potential.

“We need more training. We need more time with the pilots flying the drones,” she said.

“Then we need the platform to be available for us to do that training and we definitely want to continue developing this and really push the limits of what these drones are capable of so that we can push the limits of what we can do medically.”

The 173rd Medical Company plans to further integrate drone blood delivery into upcoming exercises this fall and spring.

Until then, drone teams will continue simulations—both with and without payloads—preparing to meet the demands of future combat.

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