Check the listing for details. Belgian air force A-109 BA Hirundo helicopter roundel patch. Condition: New, Made in Belgium. Listed at 5.99 USD. The Belgian air force A-109 BA Hirundo helicopter roundel patch is an original collectible item featuring the distinctive markings of the Belgian Air Force. This patch represents the military aircraft used by the Belgian armed forces, specifically the A-109 BA Hirundo helicopter. With a focus on militaria and the country of origin being Belgium, this patch is a unique piece for collectors interested in military memorabilia.