 Similar firings in support of the upper atmosphere research were made using 5" and 7" guns at Highwater, Alaska, and Wallops Island Virginia.By the time the program ran down, about 1,000 firings had taken place, and the data collected during HARP represents half of all the upper-atmospheric data to this day.The Martlet-2 was only a stepping-stone on the way to Bull's real interest, a gun-launched rocket that could reach outer space.