This afternoon, I saw a mysterious white-fuselage 707 powered by CFM56 engines on the landing pattern to Moffett Federal Airfield in Mountain View, CA. Note that this is NOT an AWACS or JSTARS plane, as the plane lacks the distinctive antenna mounts of these two plane types. Also, the plane's livery was difficult to discern, as it looks like it does not have USAF markings.
Is it possible I may have just seen a US Navy E-6A TACAMO communications plane? One thing I did notice is that the plane flying over lacked the wingtip modifications of the E-7A. In short, I'm mystified.