Firstly just wanted to point out that when playing in co-op all the human players are in the same fireteam, just it seemed that some people thought that in co-op each human player commanded their own fireteam which is not the case.
Due to technical constraints the tether distance in co-op is 275m, but this shouldn't impact at all on the realism of the game, as in reality USMC 4 man fireteams are trained to stick together as a unit and support each other without becoming separated by too great a distance.
Also I can confirm that in SP the tether is not present and you can separate as far you'd like from your other fireteam members if you wish, though of course this is not recommended and will normally result in a quick death!
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