Thyng was promoted to full colonel at the age of 26 and returned to the United States, where on November 1, 1944, he was made commander of the 413th Fighter Group at Bluethenthal Field, North Carolina.
This group, consisting of Republic P-47N Thunderbolt fighters, trained for long-range escort operations for B-29 bombers of the Twentieth Air Force.

On May 19, 1945, the group deployed to the Pacific.
It conducted several strafing missions from Saipan to the Caroline Islands in May before beginning operations from Ie Shima in June.
The group engaged in dive-bombing and strafing attacks on factories, radar stations, airfields, small ships, and other targets in Japan, and made several attacks on shipping and airfields in China during July.
Thyng's group flew its sole B-29 escort mission on August 8, 1945, to Yawata, Japan.

Col.
Thyng is credited with 22 sorties but despite some accounts asserting that he shot down one of the 16 Japanese aircraft credited to his group, he was not awarded any kills in this theater and the credit is likely based on submission of a "probable".
 Col.
Thyng remained in command of the 413th FG until October 14, 1945.
Thyng was promoted to full colonel at the age of 26 and returned to the United States, where on November 1, 1944, he was made commander of the 413th Fighter Group at Bluethenthal Field, North Carolina. This group, consisting of Republic P-47N Thunderbolt fighters, trained for long-range escort operations for B-29 bombers of the Twentieth Air Force.
On May 19, 1945, the group deployed to the Pacific. It conducted several strafing missions from Saipan to the Caroline Islands in May before beginning operations from Ie Shima in June. The group engaged in dive-bombing and strafing attacks on factories, radar stations, airfields, small ships, and other targets in Japan, and made several attacks on shipping and airfields in China during July. Thyng's group flew its sole B-29 escort mission on August 8, 1945, to Yawata, Japan.
Col. Thyng is credited with 22 sorties but despite some accounts asserting that he shot down one of the 16 Japanese aircraft credited to his group, he was not awarded any kills in this theater and the credit is likely based on submission of a "probable".  Col. Thyng remained in command of the 413th FG until October 14, 1945.
Harrison Thyng