You talk to the T.K., I.M., or the C.C. in the respective city and select "Item exchange". Depending on what medal you have, you can purchase certain items. This is under Ribbons, for 1000 allied notes.
ok, no idea how to purchase this item. Says purchasable from this NPC but I have no idea how to. it's not an option even after completing a few WotG missions and quests. someone, HELP!