Many of the drones aren’t particularly fast or high-tech, but they are cheap enough for the Kremlin to launch more than 700 in one night, in an effort to overwhelm Ukraine’s air defenses. Here’s what we know.

When Defense Secretary Pete Hegseth stood on the Pentagon’s parade field last month to announce a memo meant to accelerate the U.S. military’s ability to stock up on cheap drones, the sheet of paper he signed was delivered by a member of the Marine Corps Attack Drone Team, a Quantico, Va.-based unit that just got its start in January.