["HISTORY: United States","20th Century","HISTORY: Wars & Conflicts","World War II","General","HISTORY: Military","United States","TECHNOLOGY & ENGINEERING: Military Science","HISTORY: Military","Weapons","HISTORY: Military","Nuclear Warfare","SCIENCE: History","HISTORY: Asia","Japan","HISTORY: Wars & Conflicts","World War II","European Theater","HISTORY: United States","State & Local","General","Weapons and equipment","Nuclear weapons","Asian history","History of the Americas","Military history","Second World War","History of science","Military engineering","Ordnance, weapons technology","Local history","Europe","Japan","United States of America, USA","20th century, c 1900 to c 1999","c 1938 to c 1946 (World War Two period)"]