Someday the U.S. military could drive a trailer to a spot just beyond insurgent fighting and, within minutes, reconfigure part of the atmosphere, blocking an enemy's ability to receive satellite signals, even as U.S. troops are able to see into the area with radar. "This scenario may not be far away," says Defense Tech pal Sharon Weinberger in this month's edition of the always-excellent Defense Technology International. An engineer with Research Support Instruments in Princeton, N.J. recently completed the first phase of work for a U.S. Air Force sponsored project called Microwave Ionosphere Reconfiguration Ground based Emitter, or Mirage. The...