There were problems, too. At least two Predators crashed in Kosovo, and three crashed in Iraq. Those incidents reveal several vulnerabilities. The Predator can fly as high as 25,000 feet, beyond the range of many surface-to-air weapons. But the resolution of video and still images from that al ude can by spotty, forcing the airplane to fly much lower, perhaps as low as 10,000 feet.
At low al ude, the unstealthy, relatively slow-moving Predator presents an easy target for air-defense weapons. The Pentagon hasn't released exact details of all Predator crashes, but it does acknowledge that it has lost about 20 of the aircraft since the program began. "The bulk of those," says an Air Force official, "were lost over enemy territory."
As testing continued, the Pentagon highlighted other deficiencies. In a 2001 report, the Pentagon's operational test and evaluation office argued that "the Predator UAV system is not operationally effective or suitable."