Anthony,
I would estimate the B&W aerial to be between the years 1951 and 1957.
If you look on historicaerials.com and focus specifically on the practice range, you can see the changes between 1951-1957 The practice range pictured in the aerial you posted looks similar in size and shape to the practice range seen on the 1957 aerial. However, in the 1957 aerial you can see a road or trail running below the range, which does not exist on the aerial you posted.
The 1951 aerial shows no road or trail similar to your aerial, but the land cleared for the range has yet to take the shape we see in the aerial you posted.
Outside of that, I have no knowledge of when the range opened, but I thought I could help you narrow it down.
Bret