Department of Defense Secretary Pete Hegseth has said that the pilots aboard the U.S. Army helicopter that collided with an American Airlines plane were wearing night vision goggles — but an expert says that could have hurt their ability to see other aircraft.

Jim Cardoso, the Senior Director for the University of South Florida’s Global and National Security Institute and a U.S. Air Force veteran, discussed the fatal collision between a U.S. Army helicopter and an American Airlines aircraft.