Think that the 493rd FS is another 'Grim Reapers' (USAF).
(According to a link through the DoD website, the 31st Cadet Squadron at the Air Force Academy is also, believe it or not, invested with the same monniker.)
However, the 13th Bombardment Squadron was 'The Devil's Own Grim Reapers'...
If you go
here (and can tolerate the music) there is a badge that looks really rather similar to that in the picture. The 13th later flew B-57s.