Rank

Rank is a very broad term with several meanings. As a noun it is usually related to a relative position or to some kind of ordering (see also ranking). As an adjective it is used to mean profuse, conspicuous, absolute, or unpleasant, especially in relation to the sense of smell or taste. Certain low-level grunts feel this isn't a coincidence.

On the Wiki

When seen in the Character Boxes, it indicates the Level the Character is inside the Organizations Power Structure on a scale of 0-10. It might also give an idea of their Job, or thier duties Examples:

Cobra

Common Viper: Rank 1 - Viper
Doctor Brainstorm: Rank 4 - Named Agent
Major Bludd: Rank 9 - High Command
Cobra Commander: Rank 10 - Supreme Leader

G.I. Joe

G.I. Joe's ranks are a little more detailed, as they also include the paygrade and a rank name. However, the 0-10 Scale does not always follow the traditional Enlisted/ NCO/ Officer scale. Many High Level NCO's (E-9's) are considered higher level Joes in the Ranking Systems than many Officers of High Rank (O-6 and Below). This represents the fact that Delta Forces often follow experience over paygrade and rank in field missions.

Greenshirt: Rank 1 - E-5 - Sergeant
Coldshot: Rank 3 - E-7 - Chief Petty Officer
Ace: Rank 8 - O-6 - Colonel (Col.)
Scarlett: Rank 9 - E-9 - Sergeant Major
General G.I. Joe: Rank 10 - O-10 - General

Decepticons

10 - Leader

9 - Faction XO

8 - Division Heads

7 - Division XO

6 - Special Teams leaders

5 - Special Teams XOs

4 - Lt -

3 - Sgt -

2 - Corporal -

1 - Private -

Autobots