Prior to 1963, the Medal of Honor could be awarded for actions not involving direct combat with "an enemy of the United States" or "opposing foreign force [s]" (actions against a party in which the U.S. is not directly engaged in war with). 204 men earned the medal in this way. The vast majority of the non-combat medals were awarded to members of the United States Navy for their actions during boiler explosions, man-overboard incidents, and other hazards of naval service. The list includes 10 Navy officers and men who earned the Medal of Honor for non-combat actions during the First World War and one who received it during World War II.