Hey, nice to see the caption and the colorized version! Thanks BroJoeK!
30th NC
http://www.nps.gov/civilwar/search-battle-units-detail.htm?battleUnitCode=CNC0030RI
http://civilwartalk.com/threads/william-and-john-howey-father-and-son-co-k-30th-north-carolina-infantry.94583/
http://www.thomasvenner.com/2015/03/15/the-30th-nc-infantry-defends-the-sunken-road-at-sharpsburg/
50th VA
https://en.wikipedia.org/wiki/50th_Virginia_Infantry
http://www.findagrave.com/cgi-bin/fg.cgi?page=vcsr&GSvcid=434512
37 NC
http://www.civilwarindex.com/armync/37th_nc_infantry.html
http://www.oocities.org/gaston_blues/37thNC.html