All smart bombs have a backup non-GPS based guidance system. The U.S. installed these in case China or some other power manages to destroy enough satellites to hurt the GPS net. The practical effect is that smart bombs will be slightly less accurate but will remain effective. (Also, I'm not sure GPS can be disabled selectively, without hurting other American operations in nearby Iraq or AfPak).
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Hamas: Agreement reached for return to calm on Gaza border with help of Egypt, Qatar, UN (Haaretz)
from the article: It's too bad Netanyahu and Obama didn't stop and think first