TRAVIS AIR FORCE BASE, Calif. -- Staff Sgt Ernest Crider performs an operations check on an emergency oxygen mask and goggles as part of his preflight checks on the flight deck of a KC-10A Extender. The aircraft, including fuel and crew, weighs 370,000 pounds at takeoff and will perform air refueling training over the western region of the United States. Sergeant Crider is a flight engineer with the 6th Air Refueling Squadron here.

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TRAVIS AIR FORCE BASE, Calif. -- Staff Sgt Ernest Crider performs an operations check on an emergency oxygen mask and goggles as part of his preflight checks on the flight deck of a KC-10A Extender. The aircraft, including fuel and crew, weighs 370,000 pounds at takeoff and will perform air refueling training over the western region of the United States. Sergeant Crider is a flight engineer with the 6th Air Refueling Squadron here.

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