Talk:Comparative Ranks/Officer/@comment-137.100.133.30-20200116190040

For US army/air force/ marines, O grades go like this:

OF-1: Second Lieutenant

OF-2: First Lieutenant

OF-3: Captain

OF-4: Major

OF-5 Lieutenant Colonel

OF-6: Colonel

OF-7: Brigadier General

OF-8: Major General

OF-9: Lieutenant General

OF-10: General

The general of the Army/Air Force and Fleet Admiral do not have a separate O grade.

Source: https://www.defense.gov/Our-Story/Insignias/#officer-insignia