1. January 1980: Harold Brown
Brown visited China, the first US secretary of defense to visit China since 1949.
2. September 1983, October 1986: Caspar W. Weinberger
Weinberger is the first US secretary of defense to visit China twice.
Grassroots and old friends converge in Iowa
Hagel visits China amid celebration and concern
US real estate market gets boon
Job prospects unify towns at US-China parley
First lady's worthy causes
Chinese leaders' passion for sports
Xi visits western Europe