HAL-Elbit Systems HUD Display System: India’s state owned aircraft manufacturing giant HAL has signed an  agreement with Israel’s high technology defence company Elbit Systems for supply of Digital Overhead Head Up Display Systems (DOHS) during the recently concluded Aero India-2021, the company announced on Monday. The agreement for supply of HUD display has been signed between HAL and Elbit Systems Electro Optics Elop Ltd.