Can VA education benefits be counted as income for child support?

My ex husband is retired from the military, receives VA disability payments and Ch. 33 benefits for school. His owes $58,755.13 with current support of $312. A low income calculation was used since he only reported a portion of his income and was supposed to update the courts on any further incomes/increases. He receives $1,126/mo for housing while a full time student. The monthly payment does not include the given per class for books and materials. I am wondering if the Ch. 33 benefits (E-5 w/ dep) can be counted as income. By the way, the arrears have been accumulating since '08, I have full custody of both children with no visitation on his part (his choice). Thank you in advance.