UNITED NEWS INTERNATIONAL (UNI) — The U.S. Army wants to make quieter, more lethal drones and it’s enlisted a somewhat unlikely partner to help: Uber.

On May 8, the rideshare company announced that it was working with the Army Research Laboratory to create silent aircraft rotor technology.

From the Army’s standpoint, drones are used to conduct surveillance or strike targets. That becomes much more difficult, however, if the enemy knows you’re coming.

Uber, meanwhile, has announced plans to launch prototype airborne taxis by 2020, which it said will start as piloted, but one day hopes to make them unmanned.

Through this $1-million partnership, split 50-50, Uber and the Army said they will develop and test prototypes for an ultra-quiet rotor system that could be used on a vertical take-off and landing vehicle.