I think a mission statement is great for any organization. Yes, they can be a bit corny at times, but only if you let them. Stay to real ideas and not abstract thinking.
You might be able to find a business in the area that would help you with the process. Go to team websites and see if any are posted.
A Mission statement should be reviewed regularly, but not radically change year to year. Mission Statements and Vision Statements are often used interchangably, but they are not really the same. A vision statement is usually more abstract and could be something like "Our vision is to be the world class leader in XTZ technology". Goal setting is different.
I am a big proponent of Goal Setting. Goals should be new each year, and maybe repeats of the previous year. Goals should be specific and measurable to be of real value:
Goal: We want to do better this season and win stuff and recruit more students.
Better Goals:
We will strive to win one technical award at a regional.
We will incorporate one new feature on our robot.
We will increase our team size by 10% over 2004.
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