The Modern Warfare Revolution

Call of Duty 4: Modern Warfare (2007) did two historic things at once. Its campaign — Captain Price, the SAS, a nuclear detonation witnessed in first person — set a new bar for the military shooter as authored storytelling. Its multiplayer set a new bar for everything else: XP ranks, custom classes, perks and killstreaks turned online matches into a persistent progression loop.

That loop was the revolution. Create-a-Class, Prestige, and the red-dot feedback of the hitmarker became the default grammar of console multiplayer. Modern Warfare 2 (2009) pushed the campaign's spectacle further and the multiplayer's streak-driven chaos with it; the original trilogy closed with Modern Warfare 3 (2011), developed by Infinity Ward with Sledgehammer Games.

The Vault's timeline keeps the original Modern Warfare universe distinct from the 2019 reboot continuity — same names, different canon, a distinction the Black Ops chapter also depends on.