VINTAGE 1930s US Air Corps 107th Observation Squadron DI Michigan National Guard Posted on October 28, 2024 by admin Posted in vintage PLEASE READ AND VIEW ALL PHOTOS CAREFULLY! VINTAGE RARE 1930’s US Air Corps 107th Observation Squadron DI Michigan National Guard DEVIL PIN B. “VIDER EST SCIRE” – “TO SEE IS TO KNOW”. INITIALS ON BACK “RAC”.