[3] By 1910 the family had moved to Washington, D.C. where Hart's father had a general practice and served on the staff of the Veteran's Hospital.

After graduating from Western High School in Washington, D.C., Hart began working at a bank while seeking an appointment as a cadet at United States Military Academy.

Hart entered the United States Military Academy at West Point on July 1, 1920, during the tenure of Douglas MacArthur as superintendent.

He would remain there for approximately one year before being sent to the United States Field Artillery School located in Fort Sill, Oklahoma.

[6] Following his service at the academy he would be transferred to United States Field Artillery School located in Fort Sill, Oklahoma as an instructor in 1940.

Later that year, while serving as an instructor in the Department of Gunnery at the United States Army Field Artillery School, Hart received a permanent promotion to Major on June 12, 1941.

[2] With America's entry into World War II in 1941, the military suffered from a lack of qualified officers to take command positions.

Under Hart's direction and with the blessing of Patton, Bristol developed the first Corps Air Artillery section in the entire U.S.