Next, he was assigned as a Research and Developments Coordinator in the Test and Evaluation Division, and later as the Chief of the Administration and Industrial Liaison Office with the United States Army Materiel Command in Alexandria, Virginia.

He returned to Fort Leavenworth, Kansas for an assignment as an Operations Research and Systems Analysis Officer in the Plans Division of the U.S. Army Combined Arms Center.

After attendance at the U.S. Army War College and the Defense Systems Management College, he served in a series of assignments in the Office of the Deputy Chief of Staff for Logistics for the U.S. Army, which culminated as his selection as a Special Assistant to the Deputy Chief of Staff for Logistics.

During his tenure, Aberdeen Proving Ground experienced a wide-ranging sex scandal among drill sergeants and female recruits, which surfaced in 1997.

In this assignment, he was responsible for all of the logistical support for the Army's largest major command, an organization of more than 800,000 active and reserve soldiers and 40,000 civilians.

In 2012, Shadley was elected to the Circleville High School Achievement Hall of Fame by the alumni association of his alma mater.