What is the abbreviation for ‘headquarters’ used in Marine Corps correspondence?

The abbreviation for 'headquarters' used in Marine Corps correspondence is HQ. This abbreviation is widely recognized and accepted in military contexts, making it clear and concise when referring to the command center or main office of a unit or organization. Using HQ ensures consistency and helps maintain clarity in communication, which is essential in military operations where precise language can significantly impact understanding and execution. The other abbreviations, while they might seem plausible, are not standard or commonly used within the Marine Corps, thus not fitting the established norms of military correspondence.