How do you recognize marine corps ranks in order?

Marine Corps ranks are recognized in order from lowest to highest as follows: Private (E-1), Private First Class (E-2), Lance Corporal (E-3), Corporal (E-4), Sergeant (E-5), Staff Sergeant (E-6), Gunnery Sergeant (E-7), Master Sergeant (E-8), and Sergeant Major (E-9). Officers begin at Second Lieutenant (O-1) and progress to First Lieutenant (O-2), Captain (O-3), Major (O-4), Lieutenant Colonel (O-5), and Colonel (O-6), culminating in General ranks (O-7 to O-10). Each rank has distinct insignia that indicate the level of authority and responsibility. Additionally, ranks are often denoted by their abbreviations, such as PFC for Private First Class or LtCol for Lieutenant Colonel.