Operation Redwing was a United States series of 17 nuclear test Testing detonations from May to July 1956 .

Two of these tests were detonations from balloons ; another was a blind radar test Research drop .

`` Pokhran-II '' consisted of five detonations , the first of which was a fusion bomb Use_firearm while the remaining four were fission bombs .

They were the first nuclear weapon tests Testing since Trinity in July 1945 , and the first detonations of nuclear devices since the atomic bombing Attack of Nagasaki on August 9 , 1945 .

A fleet of 95 target ships was assembled Come_together in Bikini Lagoon and hit Attack with two detonations of Fat Man plutonium implosion-type nuclear weapons of the kind dropped on Nagasaki , each with a yield of .