U.S. military radio-frequency (RF) encryption experts are acquiring in-line data encryption devices to enable military forces to track the locations of friendly and hostile forces under terms of a $99.9 million contract. Defense Information Technology Contracting Organization officials at Scott Air Force Base, Ill., are asking North- rop Grumman Aerospace Systems in Redondo Beach, Calif., to provide KGV-72 Type I program- mable inline encryption devices (PIEDs), designed and built by Harris Corp. RF Communications in Rochester, N.Y.