Two companies of Massachusetts sharpshooters, a rarity in the American Civil War, fought as independent units attached to other commands. The 2nd Company of (Governor) Andrews saharpshooters was attached to the 22nd Massachusetts Infantry during the Gettysburg Campaign.
Their distinctive monument is on Sickles Avenue in an area known as "The Loop," on the south end of the battlefield adjacent to the Wheatfield.
Composed from iPhone shots through the desktop version of 123dcatch, then messed with in Meshmixer to heal, seal and flatten the bottom a bit.
I've included the full 15mb original STL and a reduced version which is likely more suitable for slicing and printing - Cura seems to choke on the larger file size for me.