According to Wikipedia, “Missing in action (MIA) is a casualty classification assigned to combatants, military chaplains, combat medics, and prisoners of war who are reported missing during wartime or ceasefire. They may have been killed, wounded, captured, executed, or deserted”. The Defense POW/MIA Accounting Agency researches, investigates, recovers and identifies American service members who never returned from wars and various other operational loss incidents and whose bodies have never been found and identified.