Thanks for both of your post Alan.
Looking at info on the Rootsweb Holmes Co site at www.rootsweb.com/~msholmes/ it appears that many of the men listed in the Lexington Guards joined other units also. In particular, L. J. Kelly is listed with the Lexington Guards and Co K, 1st MS Cav (but I don't see him listed with the 1st MS Cav on the CW Soldiers and Sailors Database), and there were several 1st MS Cav units. If memory serves me correctly, the Lexington Guards was the only unit listed on my Great Grandmother's application.
On the Holmes Co site under Staff Officers a L. R. Page is also listed as Judge Adovate , Richomnd, VA (?).