HANOI, Vietnam –  The Vietnamese government has announced it will open three previously restricted sites for excavation by the U.S. to search for troop remains from the war.

The announcement from Vietnam Minister of Defense Phung Quang Thanh comes as U.S. Secretary of Defense Leon Panetta and his Vietnamese counterpart participated in a first-of-its-kind joint exchange of artifacts from the war in Hanoi.

A Department of Defense spokesman said in a statement the department believes Joint Prisoners of War, Missing in Action Accounting Command (JPAC) research teams will greatly benefit from access to the new sites in their search for the approximately 1,200 U.S. service members still missing in Vietnam....