he Iranian Air Force's military drill is being held over an area of 416,000 square kilometers in the central province of Semnan, simulating the Persian Gulf general area and the strategic Strait of Hormuz. On the final stage of the maneuver, the home-made and mid-range Mersad (Ambush) missile defense system thwarted a hypothetical attack by the enemies' cruise missiles. The Mersad system successfully identified and detected intruding unmanned aerial vehicles. In recent years, Iran has made major breakthroughs in its defense sector and attained self-sufficiency in producing important military equipment and hardware. Iran has also conducted major military drills to enhance the defense capabilities of its armed forces and to test modern military tactics and state-of-the-art army equipment. The Islamic Republic maintains that its military might poses no threat to other countries, stating that its defense doctrine is merely based on deterrence.