WW2 American Tech Radar allowed the U.S. to detect incoming enemy aircraft and ships long before visual contact. True False None The atomic bomb was developed under a secret U.S. project called Operation Thunderbolt. True False None The Higgins boat was essential to the success of amphibious landings like D-Day. True False None The U.S. had jet fighters in combat before Germany did. True False None American codebreakers cracked the Japanese naval code, leading directly to victory at the Battle of Midway. True False None Time's up Most Popular