In the Marine Corps, what rank equates to O-9?

The rank that equates to O-9 in the Marine Corps is Lieutenant General. This is a three-star general, and in the U.S. military, the pay grades for officers are designated by a system where each rank corresponds to a specific letter and number. The "O" in O-9 signifies an officer rank, and as the numbers increase, so do the ranks.

The rank of Lieutenant General is significant as it involves considerable leadership responsibilities, including commanding major commands and brigades, as well as serving in high-level staff positions. In the U.S. Marine Corps structure, achieving a rank of O-9 illustrates a high level of experience and dedication to military service, which includes executing strategic operations and overseeing large units.

Understanding this hierarchy is critical for recognizing the various levels of command and ascertaining the responsibilities associated with each rank within the Marine Corps and the broader military structure.