The only A. D. Boon(e) I could find in the CWS&S at http://www.itd.nps.gov/cwss/soldiers.cfm

is this man

A. D. Boon (First_Last)
Regiment Name 1 (King's) Mississippi Inf. (State Troops).
Side Confederate
Company I
Soldier's Rank_In Private
Soldier's Rank_Out Private
Alternate Name
Notes
Film Number M232 roll 4

I couldn't find a unit history at http://www.mississippiscv.org/mississippi_history.htm

GP