Assemble a four-person fireteam and be ready to drop into Call of Duty: Warzone™ starting at 9:30 AM PT on Thursday, August 17. Double XP begins at this time, shortly before the commencement of the Shadow Siege Limited Time Event, scheduled to begin at 10:30 AM PT. The exact operation is shrouded in secrecy, but intel interceptions from Commander Phillip Graves seem to indicate the battle you should prepare for:
“This is an airborne to ground assault of the Konni-occupied Zaya Observatory.”
— Commander Phillip Graves, Call of Duty: Modern Warfare II
Join the ranks of Shadow Company, take on Konni forces, secure chemical weapons before it’s too late, and receive numerous rewards. Additionally expect to view the full reveal of Modern Warfare III. Complete additional objectives in Operation: Shadow Siege to claim further items, such as a new Base Weapon, all immediately available in Call of Duty: Warzone and Modern Warfare II . . .
. . . and eventually Modern Warfare III thanks to Carry Forward.