Major General Leslie Groves

Brigadier General Thomas Farrell

On June 29, 1946, the Manhattan Engineer District published their report, The Atomic Bombings of Hiroshima and Nagasaki, describing the effects of the atomic bombs. The report was compiled under the direction of Major General Leslie Groves, who instructed Brigadier General Thomas Farrell to organize a special Manhattan Project Atomic Bomb Investigating Group. Their mission was to secure scientific, technical, and medical intelligence about the atomic bomb effects from Hiroshima and Nagasaki as soon as possible after the cessation of hostilities.

Brigadier General James Newman

Dr. Masao Tsuzuki

Dr. Stafford L. Warren

Farrell arrived in Hiroshima on September 8, 1946, equipped with portable geiger counters. Along with Brigadier General James Newman, Dr. Masao Tsuzuki (member of the Atomic Bomb Casualty Commission also acting as translator), and Colonel Stafford Warren, the head of the Manhattan District’s Medical Section. They remained in Hiroshima until September 14, then surveyed Nagasaki from September 19 through October 8.

Nagasaki Survey Team

The dropping of the two atomic bombs raised many military and medical questions that would eventually lead to more nuclear tests, specifically Operation Crossroads.

US Strategic Bombing Survey

Concurrently with the Manhattan District’s survey teams, the United States Strategic Bombing Survey also conducted research on the effects of the atomic bombs on Hiroshima and Nagasaki. This report (The United States Strategic Bombing Survey: The Effects of Atomic Bombs on Hiroshima and Nagasaki), published on June 30, 1946, incorporated much of what was included in the Manhattan District’s report, but more from a “lessons learned” perspective as well as future implications for use of the atomic bomb on others or on the United States. The report’s somewhat convoluted conclusion regarding the use of the atomic bombs in influencing Japan’s surrender is that it created the excuse for them to accept the Potsdam terms while saving “face” — no army without the weapon could possibly resist an enemy who had it.

Saturday Evening Post, June 8, 1946

On June 8, 1946, the Saturday Evening Post published an article by Col. Paul W. Tibbetts, Jr., the pilot of the Enola Gay who dropped “Little Boy” on Hiroshima, as told to Wesley Price, a Post stringer who wrote about aviation.

The feature story follows Col. Tibbetts from the formation of the 509th Composite Group, to practicing extreme maneuvers over the Utah desert out of Wendover (now Historic Wendover Airfield), to Tinian, and to dropping the bomb.

The captivating article provides insight into the 509th from a fresh, first-hand perspective less than a year after the bombing. Further, the secrecy of the mission is repeatedly emphasized, including a poem by an exasperated clerk at the base operations who was frustrated by the lack of information:

NOBODY KNOWS
Into the air the secret rose,
Where they’re going nobody knows;
Tomorrow they’ll return again,
But we’ll never know where they’ve been.
Don’t ask about results or such,
Unless you want to get in Dutch;
But take it from one who is sure of the score,
The 509th is winning the war.

When the other Groups are ready to go,
We have a program of the whole damned show;
And when Halsey’s Fifth shells Nippon’s shore,
Why, shucks, we hear about it the day before;
And MacArthur and Doolittle give it out in advance.
But with this new bunch we haven’t a chance.
We should have been home a month or more,
For the 509th is winning the war.

Tibbetts reflects on how he felt about dropping the bomb, saying, “We’re all living in the Atomic Age together, and the atom bomb was made and dropped for the people of the United States.”

Source:  Tibbetts Jr., P. W., & Price, W. (1946). How to Drop an Atom Bomb. Saturday Evening Post, 218(49), 18-136.