World War II Honor List
U.S. Army

KIA	Killed in action An individual who was killed in action, whether at the front, or by enemy action in rear areas, or if a prisoner of war, whether by air bombardment of his prison camp or by being shot while escaping.
DOW	Died of Wounds Individuals who were wounded and later died.
DNB	Died, Non-Battle Other line-of-duty deaths, such as from sickness, homicide, suicide, or accidents outside combat areas, including training and maneuver deaths.
FOD	Finding of Death Indiduals who were determined to be dead under public law 490. The case of when, and only when, there is conclusive proof that the person is dead, or equally overwhelming evidence that under the circumstances the person could not have remainded alive. These findings are made only after review and after a lapse of at least one year from the time of disappearance.

Source: The National Archives