The U.S. military is spending $25 billion over 20 years to build the next generation of spy satellites. This will be the most expensive venture ever mounted by U.S. intelligence services. For its money, Washington expects to get a new system of electronic cameras that can be trained on potential trouble spots anywhere on the planet on a couple of hours\' notice or less. It will be \"an incredible improvement\" in America\'s ability to spy from the sky, a U.S. official said in Washington. He said the satellites would be able to track objects as small as a baseball anywhere, anytime on the planet.