Yes, but here is the language on the Milwaukee SCCA 2011 schedule page: "A valid drivers license and a Snell M2010 or better helmet is required." http://www.scca-milwaukee.org/solo/2011/11sched.html
And, the language on the solo information page: "A valid US drivers license and Snell M2010, SA2010 or better helmet is required. Look for the sticker inside the helmet liner." http://www.scca-milwaukee.org/solo/soloinfo.html
Someone need to do some editing?