(Editor's note: This story has been updated with new information about C-17 foreign military sales customers and to correct information provided by the Air Force regarding bases that have received the aircraft.) Boeing last week received a $7 billion boost to its C-17 Globemaster III sustainment contract, owed largely to an increase in foreign military sales, the Air Force has confirmed. The company's Globemaster III Integrated Sustainment Program contract provides support for C-17 airlifters through 2021. The contract was...