Paper Photograph Spainish/American War

Troops training for Spainish-American War. Are they in California or on the eastern seaboard? Can someone help determine where this is? Click on the image to enlarge it. Post your comments, too.

CDV Union sergeant smartly uniformed

Three inverted stripes makes him a sergeant. Is it me or is there a sadness or forlorn look in his eyes? Smart uniform; is off to the war? A horseman or infantry? Click the image for more detail. Then comment, please. Click on the image.