Naming Military Units (White Giant)

I used to be able to use numbers in the name of a military unit, e.g. 1st Air Force Wing, etc.

Now, when naming a unit I get an invalid character error when using numbers.

May sound stupid, but I would prefer to be allowed to use numbers instead of having to write First, Second Unit, etc, etc.

If you hit just enough characters in the right sequence, you can block all of your enemy's attacks!

Or you could... That's gone now. Had to put an end that.