M.D. Geist I: Most Dangerous Soldier (1986) OST [Full Album]

Can somebody explain to me what the hell does M.D stand for?
Tracklist:
1. Prologue - Battlefield 0:00
2. Merciless Soldier - Vocal 02:32
3. Reckless City 06:57
4. Gang Of Craziness 09:40
5. Noah's Guards 12:19
6. Wasteland Of Hell 15:42
7. Final Program "D" 18:57
8. Brain Palace 21:15
9. Soldier Of The Devil 24:10
10. Eternal War Game 27:37
11. Violence Of The Flame - Vocal 29:19

Видео M.D. Geist I: Most Dangerous Soldier (1986) OST [Full Album] канала solidcake