I recently inherited my grandfather's WWII army jacket and I have no idea what one of the arm patches is for. On the left sleeve there is a patch for the 1st Calvary Division. The one I am questioning is on the right sleeve. Stitched on the patch is the word "STABUENO" and the image is blue, white, and red and looks like a "bomb trail with an explosion." If anyone can help with this it would be great!