The 456th earned the first of two Distinguished Unit Citations on 10 May for a mission to bomb the aircraft factory at Wiener Neustadt, Austria, for attacking despite severe losses (five shot down and the remaining 26 damaged) after the other groups on the mission turned back because of bad weather. On 23 May, returning from a mission in which they were unable to bomb, two Liberators collided in mid-air directly over the base, killing all but one of the 20 crewmen aboard and dropping live bombs on the field.