You are Texas residents. The fact you were stationed in MD does not make any of your income taxable there. If no MD tax was taken out, then you will not file any state return (TX has no state tax, of course). If MD tax was taken out then you will file a MD return to get all of that back. You would zero out your Maryland income to do this.
Here are two FAQs about Military Residence and Military Spouse Residence:
State Rules: https://ttlc.intuit.com/replies/3302301
Spouse Rules: https://ttlc.intuit.com/replies/3302301
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