Graphic courtesy of Buzz Feed
This range may be a F-35 fighter aircraft hex block. To my monitor friends, especially you guys in the Las Vegas area, please keep a close eye on this range and report any of the codes you might see on your boxes.
Speaking of Buzz Feed (the graphic at the top of this post), I am sure you will find the article We Trained A Computer To Search For Hidden Spy Planes. This Is What It Found at