The first video is from Hammertime2015 that involves NEST soldiers running down Michigan Avenue in front of hotel as explosions go off around them and I guess providing cover for Bumblebee (not clear on that part). It looks cool and also seems to have been ended early as one group of shooters stop and the other have to be physically tagged (probably due to noise) to know that cut had been called. Thanks to sp00ked yuh for the link.
Below that is more videos from niXer101. It is the exact same Bumblebee moment as above but at another angle. The third video is same angle, same area, even same explosion, but this time without the people running in the middle of it or firefight after. I am assuming it’s either a practice run or done for the visual FX crew. The last two videos show the parachuting in and firefight sequence. I guess this part was filmed multiple times as it seems to be two different takes of the same sequence. The links to the rest of his videos are below. Speaking of links, the pics in this post are from Ain't It Cool News, click here to view the rest. Thanks to DJ BigTyme Beats for the link.
Nascar I | Nascar II | Firefight | Firefight & Explosion