Problems? I don't anticipate any. But, be prepared to have at-least one document (bills, bank statements, etc.) for each month that you were out of the US ... to prove that you actually served the full 3 years away from the US.
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I agree with my colleague.
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You should not have any problem based on the 3 year bar.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.