This is an African American drummer boy in the Union army. I would mention how the youngest drummer boy ever was just seven years old, and how young boys would frequently run away to enlist as drummer boys.
Pauline Cushman (Born Harriet Wood) (June 1833 – December wearing an officer's uniform. The photograph was taken between January and June She was an American actress and a spy for the Union Army during the American Civil War.
William Jenkins Worth (March 1794 – May was a United States officer during the War of Mexican-American War, and Second Seminole War. He had led the nation’s first-ever amphibious landing (Veracruz, and accepted the surrender of Mexico City
The first photograph of an amputation - Sergeant Antonio Bustos having his leg amputated during the Mexican-American War by surgeon Pedro Vander Linden (who is holding the amputated leg) - April 18 1847