List of ambassadors of the United States to East Germany
Heads of the U.S. Embassy at East Berlin (1974-1990)
Table:
Name and Title

Presentation of
Credentials

Termination of
Mission

John Sherman Cooper, Ambassador

December 20, 1974

September 28, 1976

David B. Bolen, Ambassador

August 22, 1977

June 20, 1980

Herbert S. Okun, Ambassador

August 20, 1980

January 13, 1983

Rozanne L. Ridgway, Ambassador

January 26, 1983

July 13, 1985

Francis J. Meehan, Ambassador

September 16, 1985

November 30, 1988

Richard Clark Barkley, Ambassador

December 19, 1988

October 2, 1990

Given the following table concerning 'List of ambassadors of the United States to East Germany' (see 'Heads of the U.S. Embassy at East Berlin (1974-1990)'), give a one-line statement limited to the highlighted cells and provide it inside the JSON object {"answer": "YOUR ANSWER"}.