You can file for divorce while he is deployed, however he may invoke a stay under the Servicemembers' Civil Relief Act until his military service no longer prevents him from appearing and defending. Of course if you and he agree on the terms of a settlement, you can do so whether he is deployed or not.
In the meantime, he is required to support his dependents. You can go through his chain of command, or you can talk to the JAG office nearest you.
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