3rd of May 2013:
By sheer accident, my mom and I ended up visiting the Vietnam War Memorial and where able to witness a ceremony called "Status Change". I was not aware of this practice, it is generally unannounced and supposedly occurs once a year.
Each Soldier (KIA), has a Diamond engraved next to their name
Each Soldier (MIA), has a Cross engraved next to their name.
As human remains are found and identified, their "status" on the Vietnam War memorial is updated, by having the engraved Cross changed to an engraved Diamond. This was done in the most respectful and dignifying manner, almost could be likened to a funeral ceremony.