It's a large tintype. He was in the 5th Infantry and the 16th Infantry. He joined the Army in 1858 and in 1869 then joined the Navy and was aboard the U.S.S. Lancaster until 1871. (Ignore the 1858 date on the first photo). Thanks!
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.