(No off topic) : In accordance with military Standard Operating Procedures (SOP), an army officer assigned to gate duty for base protection is authorized to carry a firearm. Therefore, this action does not constitute power gaming, as it aligns with realistic and standard military protocols.
However, The Godsfather did "meta-gaming" by referencing "power gaming" (PG) in roleplay. Since PG is an OOC (out-of-character) rule, his character would not have in-character knowledge of this concept. By bringing up PG in roleplay, he clearly broke the RP rules by mixing IC (in-character) and OOC (out-of-character) information.