High Quality Content by WIKIPEDIA articles! Rustom (English: Warrior) is a Medium Altitude Long Endurance unmanned combat air vehicle (UCAV) being developed by DRDO for the three services, Indian Army, Indian Navy and the Indian Air Force of the Indian Armed Forces. Rustom is derived from the NAL`s LCRA (Light Canard Research Aircraft) developed by a team under the leadership of late Prof. Rustom B. Damania in the 1980s. The UAV will have structural changes and a new engine. Rustom will replace/supplement the Heron UAVs in service with the Indian armed forces.