Everything you have received is correct. He does not have a state filing requirement if his income is only military pay. This is not that uncommon for military filers.
PA filing requirements for residents is at least $33 in PA Gross Taxable Income. Military pay for duty outside of PA is not PA Taxable Income. So unless he had other income sources that exceeded $33 then he does not have a PA filing requirement.
Here is the PA DOR reference and instructions for PA-40.
MD DOR says military personnel who are residents of another state and only have military source income do not have a filing requirement in MD.
Here is a MD reference.
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