Operation Buster-Jangle was a series of seven (six atmospheric, one underground) nuclear weapons tests conducted by the United States in late 1951 at the Nevada Test Site. Buster-Jangle was the first joint test program between the DOD and Los Alamos National Laboratories. 6,500 troops were involved in the Desert Rock I, II, and III exercises in conjunction with the tests. The last two tests evaluated the cratering effects of low-yield nuclear devices. This series preceded Operation Tumbler-Snapper and proceded Operation Greenhouse