WWII Army Air Forces Caterpiller Club Group. The caterpiller is slightly over a inch long. Darkened, silver colored metal.The pin has been broken off, and no hallmarks are shown. Also included is a set of aircrew wings that are clutch back, four ribbons (air medal has two silver and two gold oak leaf's), a mini air medal and two enlisted US collar discs. All came together but unfortunately we have no name attached to it. neat group.