Male students posed in school uniforms on the balcony, front porch, and in front of a building on the school grounds, presumably the Boys' Quarters.
The caption on this image identifies it as "Indian boys in first uniforms Apr. 1880." The copy of the image at the American Philosophical Society has the handwritten caption "Indian boys (from 16 different tribes) at the Indian Training School, April 20th 1880. (The ranks on the ground and lower porch show the same Sioux boys who appear in [the image of the first male students])."
John N. Choate, Carlisle, PA