Which rank corresponds to O-4 in the Marine Corps?

The rank that corresponds to O-4 in the Marine Corps is Major. In the military ranking system, each officer rank is associated with a specific pay grade, and O-4 indicates the fourth rank in the officer category.

A Major serves as a key leader and is often responsible for significant operational and administrative responsibilities. This rank sits between Captain (O-3) and Lieutenant Colonel (O-5) in the officer hierarchy. Understanding the structure of ranks is crucial in the military, as it denotes not only authority but also leadership and experience levels within the organization. Factors such as command responsibilities and career progression rely heavily on this ranking system, making it essential for cadets to familiarize themselves with these designations.