Wilf, I have definitely been wondering that myself (as someone who "grew up" in the US Army system of a squad leader, and two fire teams to a squad, each with a team leader).
One Fire-Team Leader? Absolutely, it is always useful for a squad leader, (heck, a leader at any level) to have a "second in charge", for a whole host of reasons. A second Team Leader? Hmmm... In combat, if the squad isn't operating as a single entity, then the squad leader is leading one fire team himself, anyway. It doesn't even provide any real "leadership depth", since (from what I saw) there weren't enough junior NCO's to fill all the slots, in any case.
Perhaps it is different in the USMC squads, with 3 fire teams.
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