Title: Hiroshima Peace Memorial
Content:  At 8:15 a.m. on 6 August 1945, the first atomic bomb to be used in war was dropped by the United States Army Air Forces from the Enola Gay, a B-29 bomber. The force of the atomic bomb effectively obliterated the city of Hiroshima, Japan. Earlier, on 25 July, General Carl Spaatz, commander of the United States Strategic Air Forces in the Pacific, received orders to deliver a "special bomb" attack on selected cities in Japan. The first target city chosen was Hiroshima, which had an important port on southern Honshu and was headquarters of the Japanese Second General Army with 40,000 military personnel in the city. The bomb was assembled in secret and loaded on the Enola Gay. The bomb, code named "Little Boy", possessed a force equivalent to 15,000 tons of TNT. The plane dropped Little 
Title: Surrender of Japan
Content:  On August 6 at 8:15 AM local time, the Enola Gay, a Boeing B-29 Superfortress piloted by Colonel Paul Tibbets, dropped an atomic bomb (code-named Little Boy by the U.S.) on the city of Hiroshima in southwest Honshū. Throughout the day, confused reports reached Tokyo that Hiroshima had been the target of an air raid, which had leveled the city with a "blinding flash and violent blast". Later that day, they received U.S. President Truman's broadcast announcing the first use of an atomic bomb, and promising: "We are now prepared to obliterate more rapidly and completely every productive enterprise the Japanese have 
Title: End of World War II in Asia
Content:  On August 6, 1945, a gun-type nuclear bomb, Little Boy, is dropped on Hiroshima from a special B-29 Superfortress named Enola Gay, flown by Col. Paul Tibbets. It is the first use of atomic weapons in combat. 70,000 were killed instantly; 30,000 more would die by the end of the year. Hiroshima was chosen as the target to demonstrate the destructiveness of the bomb. After the bombing of Hiroshima, Harry Truman said that "We have spent two billion dollars on the greatest scientific gamble in history—and won." Japan still continued the war, though, despite some officials' attempts to make peace through the Soviets. On August 9, 1945, a second, and more powerful plutonium implosion atomic bomb, Fat Man, is dropped on Nagasaki from a different Silverplate B-29 named Bockscar, flown by Major General Charles Sweeney. The original target was Kokura, but thick clouds covered the city, so the plane was flown to the secondary target, Nagasaki, instead. It killed 40,000 instantly, and another 30,000 would die by the end of the year. The atomic bombings were one possible reason why Emperor Hirohito decided to surrender to the Allies.
Title: 1945 in the United States
Content: August 6 &ndash; WW II: Atomic bombing of Hiroshima: The United States drops an atomic bomb (nicknamed "Little Boy") on Hiroshima, Japan, at 8:15 a.m. (local time). This sent shockwaves throughout the world as the first atomic bomb used on civilians. ; August 7 &ndash; President Harry Truman announces the successful bombing of Hiroshima with the atomic bomb, while returning from the Potsdam Conference aboard the U.S. Navy heavy cruiser USS Augusta (CA-31) in the middle of the Atlantic Ocean. ; August 8 &ndash; The United Nations Charter is ratified by the United States Senate, and this nation becomes the third one to join the new international organization. ; August 9 &ndash; The United States drops an atomic bomb nicknamed "Fat Man" on Nagasaki, Japan, at 11:02 a.m. (local time). ; August 14 (August 15 in Japan) &ndash; Emperor Hirohito announces Japan's surrender on the radio. The United States calls this day V-J Day (Victory over Japan). This ends the period of Japanese expansionism and begins the period of Occupied Japan. ; August 17 &ndash; The United States and the U.S.S.R. split up the Korean Peninsula making North Korea and South Korea 
Title: Strategic bombing during World War II
Content:  In the wake of this rejection, Stimson and George Marshall (the Army chief of staff) and Hap Arnold (head of the Army Air Forces) set the atomic bombing in motion. On 6 August 1945, the B-29 bomber Enola Gay flew over the Japanese city of Hiroshima in southwest Honshū and dropped a gun-type uranium-235 atomic bomb (code-named Little Boy by the U.S.) on it. Two other B-29 aircraft were airborne nearby for the purposes of instrumentation and photography. When the planes first approached Hiroshima, Japanese anti-aircraft units in the city initially thought they were reconnaissance aircraft, since they were ordered not to shoot at one or few aircraft that did not pose a threat, in order to 
Title: Little Boy
Content:  "Little Boy" was the codename for the type of atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945 during World War II. It was the first nuclear weapon used in warfare. The bomb was dropped by the Boeing B-29 Superfortress Enola Gay piloted by Colonel Paul W. Tibbets, Jr., commander of the 509th Composite Group of the United States Army Air Forces and Captain Robert A. Lewis. It exploded with an energy of approximately 15 ktonTNT and caused widespread death and destruction throughout the city. The Hiroshima bombing was the second man-made nuclear explosion in history, after the Trinity nuclear test. Little Boy was developed by Lieutenant Commander Francis Birch's 
Title: 1945
Content: August 6 – WWII: Atomic bombing of Hiroshima: United States Boeing B-29 Superfortress Enola Gay drops a uranium-235 atomic bomb, codenamed "Little Boy", on the Japanese city of Hiroshima at 8:15 a.m. local time, resulting in between 90,000 and 146,000 deaths. ; August 7 – U.S. President Harry Truman announces the successful atomic bombing of Hiroshima, while he is returning from the Potsdam Conference aboard the U.S. Navy heavy cruiser USS Augusta (CA-31), in the middle of the Atlantic Ocean. ; August 8 ; The United Nations Charter is ratified by the United States Senate, and this nation becomes the third to join the new international organization. ; WWII: The Soviet Union declares 
Title: Pacific War
Content:  On 6 August 1945, the US dropped an atomic bomb on the Japanese city of Hiroshima in the first nuclear attack in history. In a press release issued after the atomic bombing of Hiroshima, President Harry S. Truman warned Japan to surrender or "expect a rain of ruin from the air, the like of which has never been seen on this Earth". Three days later, on 9 August, the US dropped another atomic bomb on Nagasaki, the last nuclear attack in history. More than 140,000–240,000 people died as a direct result of these two bombings. The necessity of the atomic bombings has long been debated, with 
Title: Jacob Beser
Content:  the atomic bombs). On August 6, 1945, the first atomic bomb to be used in combat was dropped by a B-29 Superfortress bomber, the Enola Gay, over the Japanese city of Hiroshima, killing 70,000 people, including 20,000 Japanese combatants and 20,000 Korean slave laborers. The thirteen-hour mission to Hiroshima under the command of famous pilot Colonel Paul Tibbets, began at 0245 Tinian time. By the time the Enola Gay rendezvoused with its two accompanying B-29 Superfortresses at 0607 over Iwo Jima, the group was three hours from the target area. "Little Boy's" detonation was triggered by radar sensors on the bomb that measured its altitude as it fell. Beser's job was to monitor those sensors and ensure that there was no interference 
Title: Nagasaki Atomic Bomb Museum
Content:  atomic bombing would bring about a more rapid end to the war. Hiroshima, the first target, was selected to show the power of America's new weapon. The second bombing, of Nagasaki, was intended to demonstrate that America had a large arsenal. At 11:02 A.M. local time on August 9, 1945, the atomic bomb, nicknamed Fat Man as its code name by Robert Serber in the United States (after Sydney Greenstreet's character in The Maltese Falcon) was dropped on Nagasaki, forever changing the city's landscape. A mushroom cloud rose to an altitude of 45,000 ft above the city. Within the museum is a history of the city before the bomb was dropped. The 

Question: what was the name of atom bomb dropped by usa on hiroshima?
Answer: Little Boy.