During his stay in Coffeyville, Kindley enlisted in the Kansas Army National Guard.
Kindley volunteered for a transfer into the aviation branch of the United States Army Signal Corps.
He attended the School of Military Aeronautics at the University of Illinois at Urbana-Champaign.

Kindley established himself as an unlucky and somewhat untalented flier, with a series of accidents, mechanical failures, and landing mishaps.
He became part of the first group of American pilots to be transferred to England for combat training in 1917.
In the spring of 1918, he completed training and commissioned as a first lieutenant in the United States Army Air Service.

On his first flight, he was assigned to ferry a Sopwith Camel from England to the western front, but crashed on the White Cliffs of Dover.
Kindley was sent to hospital to recover.
After his release, Kindley was assigned to the Royal Air Force's No.
65 Squadron, and scored his first aerial victory on 26 June 1918 over Albert, France shooting down the Pfalz D.III of Lt.
Wilhelm Lehmann, commander of Jagdstaffel 5.

In July 1918, the United States Army formed the 148th Aero Squadron and assigned Kindley to the unit.
Kindley shot down a German Albatros D.V near Ypres and earned the unit its first kill.
Kindley was the appointed commanding officer of the 148th and promoted to captain.
While with the 148th he scored 11 confirmed kills.

His fourth kill on 13 August 1918 was the Jasta 11 Fokker D.VII of Lothar von Richthofen, brother of "The Red Baron," Manfred von Richthofen.
Lothar von Richthofen, one of Germany's finest fliers with 40 confirmed air-to-air victories, was seriously wounded and never flew in combat again.

Kindley scored four more victories in early September.
Then, during missions in late September 1918, Kindley earned the Distinguished Service Cross (DSC), Distinguished Service Cross with Oak Leaf Cluster and the British Distinguished Flying Cross.
On 24 September, he led a flight of Camels in a successful attack on seven Fokkers near Bourlon Wood, France.
Three days later, Kindley earned the Oak Leaf Cluster to the DSC by dropping bombs on and strafing German infantry, destroying a German observation balloon, taking out a German machine gun nest, shooting down an enemy airplane, and scaring two Fokker biplanes away from fellow fliers even after his ammunition had been exhausted.
During his stay in Coffeyville, Kindley enlisted in the Kansas Army National Guard. Kindley volunteered for a transfer into the aviation branch of the United States Army Signal Corps. He attended the School of Military Aeronautics at the University of Illinois at Urbana-Champaign.
Kindley established himself as an unlucky and somewhat untalented flier, with a series of accidents, mechanical failures, and landing mishaps. He became part of the first group of American pilots to be transferred to England for combat training in 1917. In the spring of 1918, he completed training and commissioned as a first lieutenant in the United States Army Air Service.
On his first flight, he was assigned to ferry a Sopwith Camel from England to the western front, but crashed on the White Cliffs of Dover. Kindley was sent to hospital to recover. After his release, Kindley was assigned to the Royal Air Force's No. 65 Squadron, and scored his first aerial victory on 26 June 1918 over Albert, France shooting down the Pfalz D.III of Lt. Wilhelm Lehmann, commander of Jagdstaffel 5.
In July 1918, the United States Army formed the 148th Aero Squadron and assigned Kindley to the unit. Kindley shot down a German Albatros D.V near Ypres and earned the unit its first kill. Kindley was the appointed commanding officer of the 148th and promoted to captain. While with the 148th he scored 11 confirmed kills.
His fourth kill on 13 August 1918 was the Jasta 11 Fokker D.VII of Lothar von Richthofen, brother of "The Red Baron," Manfred von Richthofen. Lothar von Richthofen, one of Germany's finest fliers with 40 confirmed air-to-air victories, was seriously wounded and never flew in combat again.
Kindley scored four more victories in early September. Then, during missions in late September 1918, Kindley earned the Distinguished Service Cross (DSC), Distinguished Service Cross with Oak Leaf Cluster and the British Distinguished Flying Cross. On 24 September, he led a flight of Camels in a successful attack on seven Fokkers near Bourlon Wood, France. Three days later, Kindley earned the Oak Leaf Cluster to the DSC by dropping bombs on and strafing German infantry, destroying a German observation balloon, taking out a German machine gun nest, shooting down an enemy airplane, and scaring two Fokker biplanes away from fellow fliers even after his ammunition had been exhausted.
Field Eugene Kindley