Your share of your ex-husband's military retirement is considered alimony, deductible by him and reportable by you.
If DFAS pays you directly and sends you a Form 1099-R, you report that amount on your tax return (in Retirement Plans > Pension Plans (1099-R).
If he pays you directly, report it under Alimony Received interview, under Less Common Income.
In 2008, the Tax Court recently ruled that a taxpayer’s payments to an ex-spouse under the Uniform Services Former Spouse Protection Act (USFSPA) representing her share of his military retirement pay were deductible alimony payments. - See more at: http://www.journalofaccountancy.com/issues/2008/jan/pensionisalimony.html#sthash.FvXKK2gK.dpuf
