While I do agree that having 3 of the same squad to circle is a bit much, sometimes it is nice to have more options to choose from, for example having 3 assault squads, one with smgs, one with assault rifles and many one event squad.
My suggestion is not to limit the amount of squads you can take in to combat, but limit the spawning of more than two of the same type after another, similar how you can’t spawn the same squad all the time.
That way people won’t be able to only use one squad type but still have multiple options to choose from, especially with the amount of event squads some players have laying around.