A NASA T-38 training jet is seen as it flies over Washington, DC, Thursday, April 5, 2012. NASA, in cooperation with the Federal Aviation Administration, conducted training and photographic flights over the DC metropolitan area. T-38 aircraft have been used for astronaut training for more than 30 years as they allow pilots and mission specialists to think quickly in changing situations, experiences astronauts say are critical to practicing for the rigors of spaceflight. Image Credit: NASA/Robert Markowitz
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