The Louisiana Native Guards, formed by free blacks, offered their services to the Confederacy, but when the Confederates REFUSED to accept them, they immediately joined the Union Army under General Ben Butler. That's why their wearing Union Army uniforms in your photograph.
I know that. But I believe that DixieOklahoma would like us to believe that the picture was of them in confederate service. Since the confederates refused their service then that couldn't be possible, could it?