Agencywide announcement comes on heels of report criticizing 2003 awards program as too expensive.
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Critics fear overhaul may change focus, priorities of Senate Governmental Affairs panel.
The president is unlikely to order a clean sweep of his appointees, but may move up junior officials as Cabinet chiefs opt for a graceful exit.
Some union representatives say the Pentagon is backing away from a promise to provide details on its new personnel system.
Board encourages use of technology in the hiring process, but warns it must be accompanied by a significant investment in planning and personnel.
Opponents say legislation would interfere with competitive sourcing initiatives.