Neat picture find! That is the photograph taken on September 21, 1898, as described in the Link posted by Fred G.

When Company L arrived back at Freeport by train, (after a period of quarantine, I'm sure), they were greeted at the station by dignitaries and the Band, paraded up town, and posed for a unit photograph at "the old German Insurance Company Building".

FWIW - There are three officers in the center of this photograph. Captain Kling is likely in the middle with 'decorations', bracketed by 1st Lt. Ottenhausen and 2nd Lt. Yount.

(Lots of German families in Freeport, Ill., in 1898).