You need a joint sponsor, if his 2012 income was not even 100% of the poverty line.
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.
What matters is his current income. If he doesn't qualify now, you will need a co-sponsor. If he was working and earning $3,000/month but never filed taxes, then he should contact a tax preparer to clear up his obligations
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I would agree with Attorney Berman. You appear to require a join sponsor. Military or not, the rules are the same for I485
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