Arjun (Sanskrit: अर्जुन) is a main battle tank developed by India's largest defense contractor, the Defence Research and Development Organization (DRDO), for the Indian Army. The tank is named after Arjun, one of the main characters of the Indian epic poem, the Mahabharata. The delays and failures in its development from the 1990s to the 2000s prompted the Indian Army to order vast numbers of T-90S tanks from Russia to meet the defense needs that the Arjun had been expected to fulfill.