Clements and the third pilot , Lt. Hammond , called off their pursuit at 22,500 feet ( 6,900 m ) .
Only one of Mantell 's wingmen , Lt. Albert Clements , had an oxygen mask , and his oxygen was in low supply .
Lt. and the third pilot , Lt. Hammond , called off their pursuit at 22,500 feet ( 6,900 m ) .
Only one of Mantell 's wingmen , Lt. Albert Clements , had an oxygen mask , and his oxygen was in low supply .