Retirement tax questions

If my ex pays me directly (dfas will not, I am NOT 10/10) WHERE do I put this income I receive on my tax form? My ex is making me put it as alimony, my decree says I do NOT receive alimony, plus my state does NOT tax military retirement pay so if I claim it as alimony, I am not only listing it incorrectly AND i'm paying state tax and it is NOT state tax, I have no 1099R as proof!