Budget pressures may be at the heart of another sharp turn in the GPS III program early this month when Air Force Space Command (AFSPC) released a "sources sought" request for expressions of interest from companies able to replace GPS III prime contractor Lockheed Martin as the builder of the last 22 GPS III satellites. The move opens the door to GPS IIF prime contractor Boeing, as well as others, to capture a portion of the GPS III contract. It may also be a path for the Air Force to force Lockheed Martin to renegotiate its price for building the satellites.