I've only ever been to one race. When i was stationed at Nellis AFB in Las Vegas, Caesar's Palace held a Formula One race in their parking lot. Being Vegas and glitzy the local civilian skydiving club I was in was used to start the race. Our three most experienced members jumped in and onto the track from 10k feet. One of them holding the starting flag, which he handed to the official to start the race. (the pic is of the finish of the race) I was part of the ground crew popping smoke grenades from the top of Caesars and on the ground to show the divers the wind direction and speed. It was tricky because they had to land between a skyscraper and grandstand. But they all came down on the track. One, the club president was an ex-army Golden Knight and had over 8000 jumps. I had seen him land on a frisbee placed in a field as his target. :0