It's a possibility that the charter schools might not accept your son due to his needs, but that possibility is slight depending on whether or not the school is a conversion charter school or a new charter school. When I worked as an autism consultant a couple of years ago I worked with a family on Schofield Barracks and they chose to send their son to Loveland Academy because his home school could not provide for his needs. Because of the Felix Consent Decree a lot of schools have been forced to meet the needs of these children and haven't been well prepared to do so. Things have improved, but there is still a long way to go.
Check out my Stampin' Up! website: http://beccasuelovestostamp.stampinup.net
I'm still developing it, but thought I'd share now. Let me know what you think. Any changes? Suggestions?