Out of all of the A-10 Thunderbolt II aircraft in the U.S. Air Force’s fleet, an A-10 Warthog with the serial number 81-994 may be among the most unique for one simple reason: it’s the only aircraft we know of to sport kill markings for taking out a cow downrange.
Assigned to the Red Devils of the 107th Fighter Squadron, 127th Wing of the Michigan Air National Guard at Selfridge Air National Guard Base, the A-10 in question has been spotted in official Air Force photos sporting a yellow kill marking for a cow alongside those for ordnance released.
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An A-10 with the 107th Fighter Squadron flies with World War II devil scheme in commemoration of the Selfridge Air National
Guard Base centennial celebration on Oct. 11, 2017. The cow victory marking is clearly visible on the aircraft’s fuselage.
Assigned to the Red Devils of the 107th Fighter Squadron, 127th Wing of the Michigan Air National Guard at Selfridge Air National Guard Base, the A-10 in question has been spotted in official Air Force photos sporting a yellow kill marking for a cow alongside those for ordnance released.

The real story behind how an A-10 Warthog ended up with a cow kill marking
It didn't go down the way you may have heard.

An A-10 with the 107th Fighter Squadron flies with World War II devil scheme in commemoration of the Selfridge Air National
Guard Base centennial celebration on Oct. 11, 2017. The cow victory marking is clearly visible on the aircraft’s fuselage.