I suggest you contact Job Corps directly to get a copy of your GED. They should be able to email, fax, or mail you a copy. Below, I've included a link to the Job Corps contact information. You can find the phone number or email address of the specific Job Corps center that you studied with.
I believe that it's actually possible to get a copy online and print it on your own. It is a lot faster, especially now (since it's a Christmas season). People can spend a whole day waiting in the line or calling them by phone. Also, if you are trying to come with a worthy school, college or job application be sure to check these neat ideas: