According to your question, he was not married when you became pregnant, so no. He will be required by regulation to support your child, but you should also see a lawyer in your area for assistance with setting up a child support arrangement.
No law against fathering children.
There should be one for irresponsible morons like the guy you dated, but there aren't.
See an attorney as your pregnancy progresses to discuss paternity and child support matters.
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If the Airmen was not married then, no, he has done nothing illegal under UCMJ as it relates to Adultry. But, you would be wise to seek a family law attorney to ensure you get appropriate child support.
Consider that as well as monetary payments, your child will be able to receive medical care via his military medical insurance. Having children is expensive and their initial medical appointments and needs can add up! Although you may be upset, resolving this issue with the assistance of an attorney and as amicably as possible can be a huge weight off your shoulders.