The last 3 Call of Duty titles join MW2 on Steam for the first time

The library of Call of Duty games on Steam grew in a big way today, and all of the new titles are on sale.

Call of Duty: Modern Warfare, Call of Duty: Black Ops Cold War, and Call of Duty: Vanguard can now be purchased and played through Steam for the first time, following in the footsteps of Modern Warfare 2, which joined Steam in October.