Upvote:0
Looks like the same one at West Point. https://history.army.mil/museums/IMCOM/westPoint/index.html
very bottom of the page, on the right.
Upvote:8
This is a partial answer. This looks like a German Hussar uniform, as shown on the web page. This style of jacket (called an "Atilla") seems to be a distinct part of the uniform of Hussars. The cap badge is distinctly German. But the German Army had many Hussar regiments, and I don't know how to tell the rank. Their youthful appearance, and the lack of extra decoration, make me think the two figures in the photo were relatively junior in rank.