When President Trump announced that the U.S. had “destroyed” an Iranian drone, he didn’t specify whether it was shot down — that’s because electronic jamming technology was reportedly used to take “defensive” action.

The technology, called the Light Marine Air Defense Integrated System, was tethered to an all-terrain vehicle on board the USS Boxer, a defense department official told Military.com. The device is typically used on the ground but is now being tested on Navy ships.