In 1968, he was appointed to be Principal Deputy Assistant Secretary of Defense for International Security Affairs and was a protege of Paul Nitze. Earle served as the Defense Advisor to the US Mission to NATO from 1969 to 1972.
In 1968, he was appointed to be a key advisor in international security affairs at the Defense Department and worked closely with Paul Nitze. Earle served as the Defense Advisor to the US Mission to NATO from 1969 to 1972.