The military also excludes people who are overweight, too tall, too short, too thin, have disabilities, have criminal records, have low IQs, etc.
Oddly enough, it seems like they're more interested in upholding US Policy and protecting the United States from all enemies, foreign and domestic, than they are in being an employment service. I'm sure that would have changed if John Kerry would have been elected.
I guess Kerry would have even forced commercial airlines hire totally blind people to be commercial airline pilots.