Hi Terry, I knew you could help! We found a little more information, CMI is Central Masonic Instuite,Alabama. It appears that it's a cadet button from the school. The 62nd Alabama regiment fought in the area we found it, and appears to have been mostly boys, aged 16 to 18. They were relieved after about a week, and sent to continue the fight at Blakeley. A fellow on an Internet fourm looked this button up in the North/South traders price guide, it lists at $1500+ in excavated condition, with the notation that it's rare. What a find for my friend! Now we need to go back and hammer that spot.