What is Area 2 a division of that includes Nuclear weapons testing?
Area 2 (Nevada National Security Site): Area 2 is a division of the Nevada Test Site in the Mojave Desert. Nevada Test Site:  Nuclear weapons testing at the Nevada Test Site began with a 1-kiloton-of-TNT (4.2 TJ) bomb dropped on Frenchman Flat on 27 January 1951.
Nevada Test Site