Thanks for the feedback everyone! I was pretty much thinking that it would be better to see if the company that I end up getting a job with wants employees to have Six Sigma training, and would therefore pay for it, but I just wanted to hear from folks who've had personal experiences with it.
Heck, I was trained at my company without any requirement to do 6 sigma work at all.
The way that this was explained to our class was that companies will do this so that everyone in the company at least has some knowledge of the lean/six sigma philosophies and can therefore understand why things are done the way they're done at the company. The woman who spoke to our class is VP of Six Sigma for Emerson and said that something like 75% of their employees have had at least yellow belt training.