Greetings "Scott" !!
You should realize that, during WWII, the Germans used many definitions (Militarily) for such simple things as the letter " M " and " O ". You have chosen to use the most common definition of the "M" as to relate to the word: " motorisiert'.
I would point out to you that other meanings of the simple "M" letter could be:
Marine Station Nordsee
For the letter "O" you have chosen: "Orstfest".
Other meanings of the simple "O" letter could be:
Marine Station Ostsee
FWIW: It takes a long time, and much research, to unravel what exactly the context of each German letter/word means in its use during WWII.
Best regards & don't give up hope !!