KIA means killed in action, whether at the front or by enemy action in the rear areas. Or if a prisoner of war, whether by air bombardment of his prison camp or being shot while escaping;

DOW, persons who were wounded and later died;

DOI, those who suffered fatal battle injuries as opposed to wounds, in combat or in combat areas and in the line of duty status;

DNB, other line of duty deaths such as from sickness, homicide, suicide, or accidents outside non battle;

FOD, those who were determined to be dead under Public LAW 490;

M, missing persons