Pentagon officials are studying a group of eight targeting enhancements that could be developed together to improve the speed and accuracy of guided weapons, defense officials say. Pentagon acquisition chief Pete Aldridge is expected to make a decision this summer on whether the initiatives -- which include enhancing the Global Positioning System, DOD's digital positioning database and the Link-16 datalink -- should move forward under Air Force leadership. The eight initiatives, constituting a "Precision Engagement Block 0," will be approved...