Janelle,
There where 3 A, A.A. or Arch Houston's who served in the CSA.
A. Houston in 1st Texas Inf.
A.A. Houston in the 13th Texas Inf.
Arch Houston in %th Partians Rangers.

Also check this site http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=:3284841&id=I41

Mike