Air Force equipment found with Michael Blassie. From top left to bottom right: dog tag chain fragment, signal marker pouch, match holder, parachute survival guide, and ammunition pouch. First Lieutenant Michael Joseph Blassie, 24, was shot down over South Vietnam in 1972 and presumed dead. When family members received word that his remains might be buried in the Tomb of the Unknown, they petitioned the Department of Defense to open the site and conduct previously unavailable DNA testing. In 1998 the Tomb of the Unknown was opened and the remains of the Vietnam Unknown, identified as X-26, were removed. Forensic anthropologists took the aged and damaged samples of bone for mitochondrial DNA (mtDNA) testing. Because mtDNA is passed along the maternal line, scientists compared the Unknown Soldier's DNA against two samples submitted by First Lieutenant Blassie's mother and sister and found a match. On July 11, 1998, 1st Lt. Michael Blassie was buried with full military honors in Jefferson National Cemetery, Missouri, near his hometown, in the same cemetery as his father.