A group rides the LoC from Kabul to Kandahar for a sweep. Nobody questions the legality of this.
But can a group ride from Kabul to Farah for a sweep?
Sweep could have more than one destination, so it may have more than one group use multiple LoCs, but only one each.
This is correct. Sweep talks about "LoCs" as each Sweeping cube could use a different LoC than the other cubes, but as Mark says no cube may use more than one LoC per Sweep Op.