I am a Marine through and through and I would never say how one branch is better that the other.

Like I would not tell someone from the Army that they are "support staff"
Yes all kidding aside. We have the same basic set up, but with 3 four man teams. The rank of the person in charge of the squad would pend upon availability. Most of the time the team leader would be a senior E3 squad leader would be a E4 and the Plt Sgt would be an E4 or 5. I think ideally it is suppose to be: team leaders are E4, squad leaders E5, and Plt Sgt E6, but we all know how well that works.