Upvote:-1
I would suggest that the upper photo is of a sergeant, probably artillery, of a state militia unit. Frock coats of regular USA enlisted men of the period were single breasted not double.
And the lower photo appears to be a light artillery uniform circa the US Civil War. Neither appear to be infantry uniforms, either regular or militia.
Upvote:1
Top image he's wearing the 1859 regulation marine corps dress uniform with horstmann epaulettes which was used into the 1870s. Bottom is a cavalry uniform with the mounted service jacket. The style and cut of his cavalry uniform dates it to the late 1860s when that specific image was made.