Previous Tour of Duties should be purchasable through either gears coins or iron, This includes the medal challenges (so you can have enough more stars to earn in order to finish each tour)
The setup with the new store is good, but there is an issue with old tour of duty content being purchasable for a low amount of gears coins (easy to get) either in the permanent store or the featured section. This is nice for players that didn’t get a chance to grind in the previous tours, but is a slap in the face to the people that actually had to grind, Instead they should make the tour of duties purchasable (GC or iron) so that people who missed out can still earn the content, but have to grind just as much as the people who actually played at that time. It’s fair & and gives more to do after finishing the tour.