What kind of patch is this? It is on the upper right sleeve of my grandfather's Ike jacket. He was in the 13th air force. It is a circular patch 2.5" in diameter. It has a red border with a white background and a large 5-point star in the centre. Around the large star are 5 smaler blue stars. There is a large yellow/gold lightning bult diagonally coming in from the upper righthand side. Thanks.