Soldiers who died on secret mission are memorialized in Maine Their families attend the unveiling of a memorial in Columbia Falls to honor those who died when the plane they were on disappeared over the Pacific while en route to Vietnam in 1962. By DAVID SHARPAssociated Press Share John Williams of Peru, Ind., left, and his sisters, Maria McCauley of Branson, Mo., center, and Susie Linale, of Omaha, Neb., pose Saturday in Columbia Falls at a monument to honor the military passengers of Flying Tiger Line Flight 739. Their father, Sgt. 1st Class Albert Williams Jr., was among those killed on the secret mission to Vietnam in 1962.