Check out this photo of one of the “exercises” a volunteer must undergo if he wants to qualify for training to become an Air Force pararescuemen. This was just a “screening” session. If an individual passes, he then undergoes 10 weeks of the really tough stuff.
B-21 Temporary Shelters Could Also Shelter B-2s
March 5, 2021
The Air Force's experimental runway shelter for the new B-21 bomber is large enough to cover it or the B-2, and therefore reveals no information about the dimensions of the new aircraft. Two such shelters will be evaluated, but the maker of the second version hasn't been chosen, yet.