The war saw many advances in military technology and tactics; from the largest naval guns ever mounted, namely on the U.S. Monitor and Japanese Rikuchū classes with their massive 20" main batteries; the deadly improvised guerrilla tactics utilized by the Japanese in the Philippines and Southeast Asia; utilization of flight deck cruisers; the world's first jet-fighters, namely the German Me-262, British Meteor, and US F-86 Sabre; intercontinental bombers, the American B-49 'Flying Eagle'; the first flying-wing 'stealth' jet fighters, the German Ho-229 and American P-79 'Flying Wing'; widespread use of radar; the rise of the aircraft carrier as the primary weapon of navies; and the world's first atomic bombs, by far the most destructive invention of the war. But it was also seen as the dawn