These are the ranks for both Marines and Starfleet, and they often work closely together.

The first will be Starfleet, the second Marines.

Enlisted:

Crewman/Private

Specialist/Private First Class

Junior Petty Officer/Lance Corporal

Non-Commissioned Officers (NCOs):

Second Class Petty Officer/Corporal

First Class Petty Officer/Sergeant

Chief Petty Officer/Staff Sergeant

Master Chief Petty Officer/Spartan

Commissioned Officers:

Ensign/Second Lieutenant

Lieutenant, Junior Grade/First Lieutenant

Lieutenant/Captain

Lieutenant Commander/Major

Commander/Lieutenant Colonel

Captain/Colonel

Flag:

Rear Admiral/Colonel of the Admiralty

Vice Admiral/Brigadier General

Admiral/Major General

Executive Admiral/Lieutenant General

Fleet Admiral/General