Helicopter Bell OH-13S Sioux Serial 3999 Register ES709 used by Elliniki Aeroporia Stratou HAA (Hellenic Army Aviation). Aircraft history and location Aircraft History ES709 Elliniki Aeroporia Stratou 2010-06-10Hellenic Army Aviation 10jun10 preserved at the War Museum in Athens Send Updates Use APP to upload photo @ (optional) When Now? / / Send