Yesterday afternoon, it was very clear in the sky over Anchorage, AK. I was just going to try to ignore what I saw, because as weird as it was, it was descending in altitude over the huge joint Army/Air Force base near my house, JBER. When I was trying to Google stuff about UFO's, which was weird for me anyway, I found another documented sighting on the list from Knoxville, TN, on 8/15/15 which was identical in every way to what I saw. No difference. At first I looked for an aircraft pulling a sign, but realized that it was definitely something, rectangular/louvred and moving slowly under its own power. I have seen some strange things over JBER, so I tried to forget it. It was SO CLEAR and interesting. I tried just to forget it.((ADDENDUM FROM SOURCE))Addendum: the person that saw exactly what I saw reported on 08/10/15, not 08/15/15. It is also interesting that we both live only miles from a large military/Air Force installation.((END ADDENDUM))