Some of the Chinese military institutions that top US military officials have visited:

* Second Artillery Force Headquarters

US Defense Secretary Donald Rumsfeld visited in October 2005.

US Defense Secretary Robert Gates visited in January 2011.

Mike Mullen, chairman of the US Joint Chiefs of Staff, visited in July 2011.

* Submarine base of the East China Sea Fleet

Mike Mullen, chairman of the US Joint Chiefs of Staff, visited in July 2011.

* PLA Armored Forces Engineering Academy

US Defense Secretary Leon Panetta visited in September 2012.

* PLA Navy North Sea Fleet headquarters

US Defense Secretary Leon Panetta visited in September 2012.

* Fourth helicopter regiment of the Army Aviation Corps

Chairman of the US Joint Chiefs of Staff Martin Dempsey visited in April 2013.

* PLA National Defense University

Chairman of the US Joint Chiefs of Staff Martin Dempsey visited in April 2013.

US Defense Secretary Chuck Hagel is expected to visit on Tuesday.