 Complete the following phrase:  He was killed by friendly fire while in France to act as commander of the fictitious First United States Army Group, part of the Operation Quicksilver deception that masked the actual landing sites for the Invasion of Normandy. During Operation Cobra, an Eighth Air Force bomb landed in his foxhole during combat near Saint-Lô when the Army attempted to use heavy bombers for close air support of infantry operations as part of the 