He counseled senior defense officials on economic , political and security issues in Asia , Latin America , Africa and the Middle East .
From 1989 to 1992 , Pham served as an appointed Pentagon official for international security affairs under the Office of the Secretary of Defense .
Pham counseled senior defense officials on economic , political and security issues in Asia , Latin America , Africa and the Middle East .
From 1989 to 1992 , Pham served as an appointed Pentagon official for international security affairs under the Office of the Secretary of Defense .