sentences:  The government wants commonalities between logistics and spares for fighters with the Navy and Air Force, which could lead to a buy of 54 naval fighters.The Indian Air Force (IAF) is the air-arm of the Armed Forces of India and has the primary responsibility of conducting aerial warfare, defending the Indian airspace, conducting strategic strikes inside enemy territory and providing aerial cover to ground troops.It is the fourth largest air force in the world, with a strength of more than 1,500 aircraft, including more than 750 combat aircraft.