While the rest of the Atomic Testing Base is working on atomic war, the Air Force is testing the use of regular bombs in large numbers.
This test area was hit by a several dozen large size bombs and these Air Force men are here to survey the damage. Pilots visit the scene to learn first hand the nature of the destruction their weapons can create.
The radar trailer told them of the approach of the bomber and the exit of the target area. The bomber can attack from such a tremendous altitude that you can't even see them from the ground.