See it on Google Maps here
Here is what it looks like from helicopter. What is it? Answer below.A hint might be in the upper corner of the image above. It is field number 2 of Eglin Air Force base in Florida, which you can see here
A pointer for pilots to help them find the airfield? No. It’s a gunnery range. Note the craters. The arrow double wedge shape was like chosen to allow for wind variance and to keep the exploding shells from starting fires in the trees. It would allow for two categories on ordnance to be tested with different ranges.