News that Call of Duty’s next crossover collaboration would be with Bethesda Softworks’ Fallout franchise leaked by datamine about three weeks ago. Now it’s official, and a blog post Tuesday from Infinity Ward has more on what that looks like and what players can expect. Let’s start with the day Call of Duty X Fallout arrives: It’s Thursday, June 20, and kicks off a Fallout: Vault Dwellers Event across Modern Warfare III, Warzone, and Warzone Mobile that lasts until 11 a.m.