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Developed By Australia & Popularized By The UK, US Marines Test Lethal Mini ‘Grenade’ Drones That Can Attack In Swarms

The US Marines have conducted drills with a mini unmanned aerial system (UAS) called Drone40 that could turn lethal when they attack in swarms.

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It was in February 2021 when this miniature drone caught the attention of defense enthusiasts when photos and videos of the British Army testing the UAS had gone viral.

Held at Camp Lejeune in North Carolina on July 7, the latest exercise was part of the 2nd Marine Division which is an “experimental infantry battalion to test new gear, operating concepts and force structures”.

Reports suggest that the drone was operated by the British Army task group deployed in Mali as part of the United Nations Multidimensional Integrated Stabilization Mission.




Drone40-Marine
A US Marine retrieves a Drone-40 during a training exercise at Camp Lejeune. (Image: USMC)

The US Marines operate other mini-drones like the combat-proven Black Hornet which is a part of the Pentagon’s secretive Project Hornet. 

It is “an advanced, hand-launched unmanned aerial system (UAS) that can be used by forward-deployed personnel to interdict and disrupt adversary electronic capabilities in contested environments”.

What is Drone40?

Drone40 is manufactured by Defendtex, an Australia-based defense company that initially designed the product keeping in mind the needs of the Australian army.

According to Australia Defence Magazine, Drone40 was first exhibited at Army Innovation Day 2016 after which it received the contract and funding for further development.

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Defendtex describes Drone40 as an autonomous loitering grenade, deployed either by grenade launcher or hand launch. Shaped like a 40mm canister or an oversized bullet, the drone is also waterproof, making it suitable for recovery during bad weather or missions at sea.


With a body of 120mm weighing 180 grams, the quadcopter drone can take a maximum takeoff weight of 300 grams and has multiple payload options for applications like long-range target engagement, intelligence, surveillance, and reconnaissance missions.

Drone40 possesses swarming capabilities, making it one of the most lethal UAVs in the world. The company claims that the swarming capabilities could enable “multiple round simultaneous impact,” or MSRI. This means that a soldier can fire multiple munitions using a launcher, with each munition working as a force multiplier.

With a range of 20 km and flight time between 30-60 minutes depending upon the payload, Drone40 system is marketed as expendable or reusable at an existing price of less than $1000 per piece.

According to reports, DefendTex is working on Drone 81, a larger round-shaped to work with mortar tubes, and there are other drone models in the works to match specific munition sizes. Another variant, Drone155, was also on display during the Australian Army Innovation Day in April 2021.

“Investment from Five Eyes military partners has evolved the Drone40 into a family of drones now covering 60, 81, and 155 mm derivatives with greater payload and range capacities,” a DefendTex spokesperson told Australia Defence Magazine.

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