He became the only senator to simultaneously serve on all three national security committees: Armed Services, Foreign Relations, and Intelligence.

In 1975, he served as Senior Military Fellow at the Council on Foreign Relations.

He served on the Council on Foreign Relations since 2002 and is the league's commissioner for civil society.

He served as a member of the Council on Foreign Relations.

He has also served as senior vice president and Washington program director of the Council on Foreign Relations.

He served as President of the Council on Foreign Relations between 1951 and 1964.

He served as chairman of the Council on Foreign Relations.

He has also served on the Council on Foreign Relations.

In November 1881, Johnston served on the Committee on Foreign Relations.

He also served as member of the Council on Foreign Relations, and as a consultant after his retirement.