The AH-64D Longbow Apache is currently the most advanced, versatile and powerfully armed attack helicopter in the world. This upgraded version of the Apache was used extremely effectively by the US Army in the Gulf Wars of 1991 and 2003. The long-range radar can be used for protection, but it is also capable of accurately acquiring up to 1000 potential targets and identifying 128 opponents. It also automatically designates the priorities for the attack mode of up to 16 Hellfire guided missiles. The Longbow system consists primarily of the fire control radar which is located atop the mast above the rotor. This Longbow system, together with the modern digital avionics and weapons, ultimately makes the AH-64D 16 times more effective that its predecessor. The British Army uses 60 WAH-64D Apaches built by Westland, which have been further modified to meet British requirements. The Dutch air force also uses a great number of these attack helicopters.