Is it anyone, or just armored car drivers? I did not see a corresponding asterisk for the one after 'All States'.You're right that you are wrong. Maryland honors every other states' permit, just as Virginia honors Maryland permits under certain circumstances.
The influence of Interstate Commerce laws:
http://uscode.house.gov/view.xhtml?path=/prelim@title15/chapter85&edition=prelim
http://wiki.marylandshallissue.org/index.php?title=Maryland_Handgun_Permit
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Maryland Recognizes The Following States' Handgun Permits
All States* (Armored car drivers who possesses a valid permits from other states, who are on duty in Maryland).[6]
6. Source: 15 U.S.C. §5902 (a) Armored Car Industry Reciprocity Act & Md. PUBLIC SAFETY Code Ann. § 5-305.