There is no expungement of federal crimes. There is a pardon process. Here is a really good web-site with a lot of very understandable information about what it takes to get a pardon for federal crimes: http://answers.google.com/answers/threadview/id/478249.html
If your conviction is for a U.S. military offense, you would have to first apply for clemency with the branch of the military which issued the conviction before invoking the pardon process.
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You don’t. There is not expungement process for federal offenses and you will not get a pardon for the offenses.
Thanks for your posting.
The answer to your question is that, as others have noted, there is no expungement statute for federal crimes, so your only option is to obtain a presidential pardon.
I hope that this helps, but please feel free to ask if you have any further questions. It's my pleasure to help in any way that I can. All the best to you.