The X-47B Unmanned Combat Air System aboard USS Harry S. Truman.

U. S. Air Force Airman conducts security at an airbase in Iraq.

U. S. Air Force Airman pushes out pallets from a C-130H Hercules.

A U. S. Air Force Airman lifts the boom of a KC-135 Stratotanker.

United States Honor Guards stand in formation at the Air Force Memorial.

A U. S. Air Force aircrew prepares a B-52 Stratofortress aircraft for a mission.

U. S. Air Force F-15E Strike Eagles approach a mission objective in eastern Afghanistan.

Firefighters put out a fire during at Minot Air Force Base, North Dakota

A U. S. Air Force C-130J Hercules pilot flies a mission over Afghanistan.

A U. S. Air Force F-16CJ Fighting Falcon approaching a KC-135 Stratotanker for refueling over Iraq.

U. S. Air Force Aerial Combat Photographer watches for threats to a F-15E Strike Eagle.

U. S. Air Force F-15E Strike Eagle aircraft drops 2, 000-pound joint direct attack munitions.

A U. S. Air Force F-16C Fighting Falcon receives in-flight refueling.

A CV-22 Osprey starts its engines at Kirtland Air Force Base.

Cockpit view of an evening landing in a KC-135 Stratotanker of the U. S. Air Force

Camp Speicher, Iraq - U. S. Air Force pilots in an Iraqi Air Force T-6 Texan trainer aircraft.

An Iraqi Air Force T-6 Texan trainer aircraft taxis out for a flight over Tikrit, Iraq.

Three F-16's fly in formation over Arizona.

Two F-16's fly in formation over Arizona.

Three F-16's fly in formation over Arizona.

Airmen at work in a MC-130H Combat Talon II.

Four F-16's fly in formation over Arizona.

A pair of F-16's fly in formation over Arizona.

Two F-16's on a training mission over the Arizona desert.

Digitally restored vector photograph of General Benjamin O. Davis Jr.

U. S. Air Force Airmen dig a trench.