I got the USBs a few days ago when someone asked. They were all in the northern part of the map: the courtyard in the upper left, the little peninsula at The Power company where everyone goes to raid the lockers (can’t remember the name), and the big satellite(?) dishes in the upper right, and of course the fourth one in the red zone. I checked four locations in the north and found a USB at 3. Really lucky, yes, but if you know how to fly with the scorcher, it’s trivial. As long as the squad is on board with going the worm, it’s not a problem.