What is the rank for the pay grade O-4 within the Marine Corps?

The correct rank for the pay grade O-4 within the Marine Corps is Lieutenant Colonel. The rank of Major corresponds to pay grade O-4, but it is actually at the O-4 level. This ranking system is standard across the U.S. military, where each pay grade is associated with a specific rank.

The hierarchy of officer ranks places Lieutenant Colonel as the next step up from Major, which is classified as O-3. Thus, the rank for O-4 is indeed Lieutenant Colonel, confirming that this is the appropriate fit for the question being asked. Understanding the structure of military ranks is essential for recognizing the appropriate chain of command and responsibilities associated with each level.