I want to Know how much does an E4 petty officer in the Navy makes?

My sons father is in the Navy and we are planning to split. WE have NEVER been married. Were just leaving each other. I plan to put him on child support because we cant come to a mutual agreement. He say I wont get anything from him but $300 dollars but hes willing to pay me $500 a month.. I feel hes just trying to settle with me because he knows I can get more! He wont let me no his pay and google hasnt answered my? So Does anyone knows how much I would get from him a month?? I plan to move back to IL and he lives in FL!