B-1's take offs are always impressive.
B-1's take off at Al Udeid, west of Doha, in Qatar, where the U.S. Air Force has based its heavy bombers to fight ISIS in Iraq and Syria can become really breathtaking if you observe the head-on departure of a Lancer coming low over you: this is what you can (almost) experience by simply watching the following video.
Noise abatement and safety procedures stateside usually prevent such maneuvers to be performed at Dyess or Ellsworth Air Force Base.