I won't give up, Shawn. I think I found another by chance. Here is the link to a site dedicated to the Pennsylvania Reserves. It's a head quarters flag.
http://images.google.com/imgres?imgurl=http://www.pareserves.com/files/flags/3rdDiv5thCorpsFlag.jpg&imgrefurl=http://www.pareserves.com/%3Fq%3Dnode%26page%3D1&usg=__Mw7lHc_UOn_PQtQJOMaLapS4QD4=&h=303&w=518&sz=88&hl=en&start=359&um=1&tbnid=gv-M5I026cFr7M:&tbnh=77&tbnw=131&prev=/images%3Fq%3Dcaptured%2Bcivil%2Bwar%2Bflags%26ndsp%3D18%26hl%3Den%26safe%3Doff%26sa%3DN%26start%3D342%26um%3D1