Library of Congress

This photo, taken between 1860 and 1870, shows a soldier holding a pistol. 

Library of Congress

A man poses in Union uniform and gloves in the mid-1860s. 

Library of Congress

In Union cavalry uniform with a cavalry saber, a soldier stands in front of a painted backdrop around 1864.  

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Brotherly love: Two Union soldiers put their arms around each other for the camera.

Library of Congress

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A Civil War soldier circa 1865. 

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Post-Civil War, a soldier dons his full regalia. 

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A Union soldier with his wife and two daughters. 

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The band of the 107th U.S. Colored Infantry. 

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A Union sailor. 

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A traveling camp photographer took this shot of a young Civil War soldier. 

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A buffalo soldier, Lt. 1st Infantry, in 1866. 

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A buffalo soldier and a young girl pose in Deadwood, S.D., between 1877 and 1890. 

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A World War I soldier stands before an American backdrop.

Library of Congress

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A 1942 soldier in Fort Knox, Ky., works on an army truck.