One of the inevitable consequences of wars is that people die. That means widows and widowers are created. It also means that babies are orphaned. Tragically, during the Vietnam War, the number of babies orphaned ran into the hundreds.
With their parents dead, the Americans decided the kindest and fairest thing to do with the babies was to airlift them out of Vietnam, and take them back to America to start a new life there. Very few people know this happened, but pictures like this are proof.