An AV-8B Harrier conducts a test flight using a biofuel blend.

An AV-8B Harrier launches from the flight deck of USS Peleliu.

An AV-8B Harrier aircraft lands on the flight deck of USS Peleliu.

An AV-8B Harrier jet launches off the flight deck of USS Peleliu.

An AV-8B Harrier prepares for takeoff as another lands aboard USS Makin Island.

An AV-8B Harrier jet lands on the flight deck of USS Peleliu.

An AV-8B Harrier takes off from the flight deck of USS Bataan.

An Airman directs an AV-8B Harrier jet aircraft on the flight deck of USS Essex.

An AV-8B Harrier jet prepares to land on the flight deck of USS Essex.

An Airman uses hand signals to direct an AV-8B Harrier during flight operations aboard USS Peleliu.

An A/V-8B Harrier receives fuel over Afghanistan from a KC-10 Extender.

Pilot in the cockpit of a U. S. Air Force F-35 Lightning II.

Close-up of the GAU-8 Avenger gun on an A-10A Thunderbolt II.

German Air Force F-4F Phantom II.

World War II propaganda poster featuring General Dwight Eisenhower.

An Israel Defense Force Merkava Mark II main battle tank.

A Royal Air Force Harrier GR9 flying low over North Wales.

World War II poster of a soldier looking forward, his helmet tilted on his head.

Vintage World War II poster of a mother and daughter canning vegetables.

M42, The Orion Nebula.

Nose art on a Curtiss P-40E Warhawk.

Digitally restored war propaganda poster.

A North American P-51D Mustang in flight near Chino, California.

Digitally restored war propaganda poster.

Close-up view of an AV-8B Harrier II.