Mission statement explained
When I worked for a company some 20 years ago, we worked on a mission statement. It was supposed to be short, vigorous and easy to remember. Together with the mission we had an explanation, a rationale, that described each part of it. The idea was that each employee should be able to say the easily remebered mission statement as a lift pitch and also to understand and agree with the meaning of it.
As you wrote, Terry, this can be taken care of in the What is TI section, and I think it could be a good idea to explicitly address each part of the mission statement there.