https://www.gamespot.com/articles/new-rainbow-six-siege-operation-introduces-two-ope/1100-6461002/

The next Operation for Rainbow Six Siege adds two new Operators and a map rework to the game. Titled Grim Sky, the Operation is a part of Siege's Year 3, Season 3. It follows Season 2's Operation Para Bellum and Season 1's Operation Chimera.

According to Rainbow Six Siege's blog, Operation Grim Sky adds Operators from two different organizations. The first "is a Defender from Great Britain. She's a tough police officer who's an expert on mob behavior and snatch-squad tactics. She knows she belongs on the front line and she won't tolerate any nonsense." The second "is an American Attacker, a specialist with a remarkably sharp mind when it comes to tactical operations. He has seen the worst in Kabul. Despite it all, he fell in love with the city. Legendary for his surgical precision, he remains an enigma within Rainbow Six."