If your wondering how to tell an officer from a recruit, here are the two easiest ways.
SEALS
1) The Alpine Jacket- The Recruits jacket, as you should notice, has what look to be a Kevlar Vest on the outside of the jacket. In comparison, the officer jacket only has straps going down the sides and in an X on the back. These details may be hard to see at times, whether through a scope or on the run.
2) The Pants- There are pouches on both legs of the recruits pants with black straps holding them in place. In comparison, the officers pants, which have almost the same camouflage pattern, have a white strap holding the pouches to the legs.

MERCS
1) The Undershirt- The Recruits Undershirt is a light blue with an unbuttoned collar. The Lieutenants Undershirt has a white undershirt with a buttoned collar and a black tie.

HACKERS
1) For Seals hackers will have a tan backpack on their backs. The legs will remain the same.
2) Hackers which are not lieutenants on the MERCS have an all black undershirt on.
Both of these are used this to identify a friendly anti-hacker. This undershirt and Backpacked Alpine can only be aquired through the browser and is not part of either gamesave.

Edited for new uniform

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