While I know nothing about this picture for sure, I am pretty sure of a few things. First, these men are from the early 20th century, most likely close to the time of the First World War. There uniforms are the uniforms that the US Army used between 1902-1926 as their winter service uniforms, at least the darker color of the shirts suggest that it is winter uniform as opposed to the lighter colored summer uniform. By the looks of the pins on their collars, I would say that they are part of a New York National Guard unit, but the picture isn't clear enough to tell me what units. Furthermore, they seem to be very close to one another, good friends or possibly more, though they could just be brothers. One thing for certain, they were very handsome men, especially the first one on the left.
I do wish I knew the story behind this photograph. What do you think the story is?