Wrong. That is there now, but even after the AF Memorial was erected taking pictures can result in you being surrounded by police officers who will at their discretion either make you delete your photos or confiscate your camera. That happened to me and it has happened to many others.
I was lucky. When the DPS officer saw my law enforcement credentials and after some discussion with his supervisor with me sitting in the back of his car, he let me keep my photos. After that his only real concern was where my gun was. I explained that I had left it locked in my truck. We parted ways on friendly terms, but I still had to be very 'covert' in taking my photographs. That was either in late 2007 or early 2008.
Like I said, they may have loosened the restrictions now because of the Memorial, but we are not talking about now, we are talking 2001 and the restrictions were very much in place then. And yes, I was on a 'public sidewalk' on Columbia Pike when the powers that be descended upon me
More: Yes, they informed me that I could take no more photographs in the Pentagon/Navy Annex ... subject to confiscation and arrest.