He would serve in these roles in the Pacific Theater of World War II until 1944, where he would be assigned to the Office of the Chief Engineer, under General MacArthur.

[3] Following this, Oberbeck was assigned to the Armed Forces Special Weapons Project where he commanded two of the nations nuclear stockpile sites, and acted as the officer-in-charge of unit training for all four military branches.

In 1955, Oberbeck graduated from the United States Army War College, after which he continued to work within the field of nuclear energy and weapons on the Joint Chiefs of Staff.

The following year, he was promoted to Brigadier General and assigned as the Director of the Special Weapons Development for the United States Continental Army Command.

These include the Defense Atomic Support Agency, Joint Task Force Eight, as the commandant of the Engineer School, and as a senior Army member of the Weapons Systems Evaluation Group in Washington, D.C..