Operation Faust

Operation Ranger was the fourth American nuclear  series. It was conducted in 1951 and was the first series to be carried out at the Nevada Test Site. All the bombs were dropped by B-50D bombers and exploded in the open air over Frenchman Flat (Area 5).

tests centered on the practicality of developing a second generation of nuclear weapons using smaller amounts of valuable nuclear materials. They were planned under the name Operation Faust.

https://en.wikipedia.org/wiki/Operation_Ranger

http://archivesgamma.fr/1951/01/27/operation-faust