That's not a rank chevron (which would appear ABOVE the elbow)....it's a veteran unit chevron ? means he was in a 3 year regiment that voted to reenlist en masse as a unit for the duration.....and received 30 days leave.
Have you been off up to the Soldier's and Sailor's system? Ancestry. com has pension cards online..... and a search of the 1880 US Census might help.
Horniste! Blas das Signal zum Angriffe!
"But in the end, it's the history, stupid. If you can't document it, forget about it. And no amount of 'tomfoolery' can explain away conduct that in the end makes history (and living historians) look stupid and wrong. "