In Vanguard and Call of Duty: Warzone, Snoop Dogg was released on April 19th, 2024 as part of the "Tracer Pack: Snoop Dogg Operator Bundle" during Season Two of the game. In Call of Duty: Mobile, he was released on April 2nd, 2024 during Season 3: Radical Raid as part of the Doggfather Draw.
To unlock the S0-14 in Modern Warfare 2, you need to progress the EBR-14 to Level 12. The EBR-14 is a marksman rifle rather than a battle rifle, and is the base gun for the Ordnance weapon platform.