Where is the video that goes with this 9/11 GIF

Cant believe people still think a plane crashed into the pentagon.. I posted numerous photos, videos and other information on our site before it got deleted the first time about this. But found this interesting GIF on a forum of what looks to be a Missile launcher on the overpass above the pentagon.. Just another theory to add to the mystery. Was the over-pass damaged, how did they do this without anyone telling.. Blocking the road ahead of time and helicoptering this thing in? Here is the GIF: