Super atmospheric and I think quite beautiful, with the (laurel leaf?) decorated cross in the foreground reading "Peace on Earth."  A little research into Roshon photography of Lebabon PA leads me to Christian S Roshon, whose Roshon Galleries were located at 142 North 8th Street, and 22 South 9th street in Lebanon, with an additional studio in Harrisburg and another gallery in Morristown, New Jersey. I believe this cabinet card dates to the 1890s; I have found a few other examples of Roshon photographs of soldiers from this period, and it appears these men are stationed at a camp, with tents behind them. It seems quite possible this is the National Guard of Pennsylvania, or NGP, stationed at Mount Gretna in Lebanon County.

6 1/2" x 4 1/2", general all over wear, which feels all of of a piece with it.