The most secretive military training in history happened in this Utah desert

Colonel Tibbets’ Secret Atomic Mission Training at Wendover

In the Utah desert of 1944, Colonel Paul Tibbets built a team with a mission so secret that loose talk meant a one-way trip to Alaska.

He chose remote Wendover Air Field, just far enough from Los Alamos but hidden from prying eyes.

The 1,500 personnel of the 509th Composite Group spent months dropping concrete "pumpkin bombs" from modified B-29s, then making sharp turns to escape an invisible threat.

Not one crew member knew they were practicing for Hiroshima.

Today, the historic Wendover airbase still stands near Tooele, where you can touch the actual hangar that housed the Enola Gay before it changed history forever.

Colonel Tibbets Built A Secret Bomb Squad In The Utah Desert

In December 1944, Colonel Paul Tibbets set up the 509th Composite Group at Wendover Army Air Field near the Utah-Nevada border.

About 1,500 people joined this top-secret team, but nobody could talk about their work, not even to family. Tibbets picked Wendover for its remote location that kept them hidden while staying close to Los Alamos labs.

The Manhattan Project bosses created this unit just to drop atomic bombs. Anyone who talked too much got sent to Alaska as punishment.

New members only knew they were picked for something important, not that they would help end World War II.

The Middle Of Nowhere Made The Perfect Training Ground

Wendover Air Field sat in Utah’s empty Great Salt Lake Desert, about 120 miles from Salt Lake City. This remote spot kept spies and locals from snooping around.

The wide-open desert let pilots practice bombing runs without anyone watching.

Since the military already used Wendover for bomber training since 1940, the extra B-29 activity didn’t look strange.

The base sat about 600 miles from Los Alamos, close enough for scientists to visit while staying secure. The tough desert also helped crews get ready for similar conditions in the Pacific.

These Weren’t Your Standard B-29 Bombers

Fifteen special "Silverplate" B-29 Superfortress bombers came to Wendover looking strange enough to make ground crews wonder what was going on.

Workers took out all gun turrets and armor to make the planes lighter so they could carry much heavier loads. The bomb bay doors got completely changed to fit one massive weapon instead of many smaller bombs.

These new doors opened and closed in just three seconds, while normal B-29 doors needed thirteen. Each plane change cost about $60,000 (around $1 million today) and happened at secret spots before coming to Wendover.

They Practiced With Giant Orange Fake Bombs

Crews trained with 10,000-pound "pumpkin bombs," huge orange practice weapons filled with concrete that matched the size and weight of the Fat Man atomic bomb.

The pumpkin bombs looked just like the round plutonium bomb scientists were making at Los Alamos. From October 1944 through August 1945, crews dropped 155 test bombs on the Wendover range.

Every practice run followed the same steps they would use over Japan: high-altitude approach, visual targeting, precise drop, and a quick turn away.

Hitting A Tiny Target From Six Miles Up

The crews learned to drop their single bomb from 30,000 feet with great accuracy, aiming for circular targets painted on the Utah desert floor.

Bombardiers used the special Norden bombsight set up for dropping one heavy weapon rather than many bombs across an area.

They stayed at high altitude to protect the plane from the atomic blast, though the crews didn’t know this reason then.

Practice runs needed them to hit within 200 feet of the target from six miles up, much more exact than normal bombing missions. Tibbets often flew practice runs himself.

The Wild Turn That Saved Their Lives

Right after dropping the bomb, pilots had to make a crazy 155-degree diving turn, banking the plane almost sideways to escape the blast zone.

This extreme move looked nothing like normal bomber training and seemed too much for regular bombs, which confused the crews.

Pilots practiced this turn hundreds of times until they could do it without thinking, needing to finish it within 43 seconds after releasing the weapon.

The move would put about 8 miles between the plane and ground zero when the bomb blew up. Crews called it the "breakaway.

The FBI Would Like To Know Your Location

Military agents watched personnel constantly, checking their mail and listening to phone calls for any leaks. Crew members couldn’t keep diaries or take photos on base.

The 509th worked under a cover story that they were training for "special bombing missions" in the Pacific using new high-explosive weapons.

Tibbets purposely created rivalry with other units at Wendover, knowing that disliked groups got less attention.

Counter-intelligence teams spread fake rumors about what the 509th was doing, including stories about new fire bombs or radar-guided weapons.

Nobody Told The Crew They Were Making History

Most people in the 509th thought they were getting ready for regular bombing raids, just with unusually heavy single bombs.

Even high-ranking officers like bombardier Tom Ferebee and navigator Dutch Van Kirk didn’t learn about the atomic bomb until days before leaving for Tinian Island. The secrecy affected families too.

Wives and girlfriends living near Wendover had no clue their husbands were preparing for the most important bombing mission in history.

Crew members noticed odd things about their training but knew better than to talk openly about what their mission might really be.

From Utah Desert To Pacific Island

In May 1945, the 509th got orders to move to Tinian Island in the Marianas, still without knowing their actual mission.

Ground crews and support staff shipped out first, followed by the combat crews flying their Silverplate B-29s across the Pacific.

On Tinian, the 509th built special facilities including air-conditioned bomb assembly buildings and heavily guarded storage areas.

The group kept practicing by dropping pumpkin bombs on Japanese-held islands to stay sharp.

Tibbets picked specific crews for the atomic missions based on their performance during Wendover training and Pacific operations.

The Morning They Finally Learned The Truth

On August 6, 1945, Tibbets finally told his crew they would drop the world’s first atomic bomb on Hiroshima.

The briefing lasted just minutes, with Tibbets explaining the weapon’s massive power and why their mission mattered.

Crew members who had spent eight months training at Wendover suddenly understood the reason for the pumpkin bombs and extreme escape moves.

The night before, Tibbets had painted "Enola Gay" on the aircraft’s nose, naming it after his mother.

The crew responded with quiet shock followed by professional focus on doing the job they had practiced hundreds of times.

Utah Training Paid Off Over Japan

The precise bombing techniques perfected at Wendover helped the Enola Gay crew drop Little Boy within 800 feet of their target point over Hiroshima.

The 155-degree evasive turn worked perfectly, giving the aircraft enough distance to survive the blast wave, just as they had practiced over Utah.

Three days later, the Bockscar crew used the same Wendover-trained procedures to bomb Nagasaki with Fat Man, the bomb design they had copied with their pumpkin bombs.

Japan surrendered on August 15, 1945, with Emperor Hirohito mentioning the "new and most cruel bomb" as a main reason.

The secret training at Wendover Air Field had successfully prepared crews to carry out the missions that ended World War II, proving Tibbets right for choosing the remote Utah base.

Visiting Tooele, Utah

The Wendover Air Base Museum at 352 E. Airport Way tells the story of the secret 509th Composite Group that trained for the atomic bomb missions. Admission costs $5 for adults and $3 for teens.

You can take daily guided tours at 1:30pm through the B-29 hangar, bomb loading pit, and other historic buildings. Special five-hour all-access tours happen on select dates for 40 people maximum.

Call (435) 665-7724 for reservations.

This article was created with AI assistance and human editing.

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