President Barack Obama

This US Marine photo is public domain.

U.S. Army Stryker armored vehicle

A U.S. Army Stryker armored vehicle from the 4th Battalion, 23rd Infantry Regiment, framed by concertina wire, departs Forward Operating Base Wolverine in Zabul province, Afghanistan, Dec. 4, 2009. The Army uses the Stryker in everyday operations because of its combination of maneuverability and firepower. (U.S. Air Force photo by Tech. Sgt. Efren Lopez/Released)

This image is public domain.

Dictionnaire Raisonné de l'architecture Française

Illustration de la page de garde du Dictionnaire Raisonné de l'architecture Française du XIe au XVIe siècle, par Eugène Viollet-Le-Duc, 1856.

Ares Rocket

With more than 23 times the power output of the Hoover Dam, the Constellation Program's Ares I-X test rocket zooms off Launch Complex 39B at NASA's Kennedy Space Center in Florida. The rocket produces 2.96 million pounds of thrust at liftoff and reaches a speed of 100 mph in eight seconds. Liftoff of the 6-minute flight test was at 11:30 a.m. EDT Oct. 28. This was the first launch from Kennedy's pads of a vehicle other than the space shuttle since the Apollo Program's Saturn rockets were retired. The parts used to make the Ares I-X booster flew on 30 different shuttle missions ranging from STS-29 in 1989 to STS-106 in 2000. The data returned from more than 700 sensors throughout the rocket will be used to refine the design of future launch vehicles and bring NASA one step closer to reaching its exploration goals.

This NASA photo is public domain.

Harrier

ATLANTIC OCEAN (Dec. 3, 2009) An AV-8B Harrier assigned to the Marine Medium Tiltrotor Squadron (VMM) 263 (Reinforced), 22nd Marine Expeditionary Unit, conducts its final take-off from the flight deck of the amphibious assault ship USS Bataan (LHD 5) after a seven-month deployment. The Bataan Amphibious Ready Group is transiting the Atlantic on its way home from a deployment conducting maritime security operations in the U.S. 5th and 6th Fleet areas of responsibility.

This US Navy image is public domain.

Arrow anti-ballistic missile interceptor

An Arrow anti-ballistic missile interceptor is launched from its mobile platform during a joint Israel/United States developmental test at the Point Mugu Sea Range in California.

This photo is public domain.