leaves.

Explore the 'Leaves' section of the Call of Duty guide. Learn about the game's plot, campaigns, characters, multiplayer, and more. Your ultimate Call of Duty walkthrough.

This article is about the first installment in the Call of Duty series. For the series, see Call of Duty (series).

Call of Duty is a first-person shooter video game that takes place during the events of World War II. It was released on October 29th, 2003, for the PC, published by Activision and developed by Infinity Ward. It serves as the first installment in the Call of Duty series.

It was not as widely distributed until the release of Call of Duty: Classic port on December 1st, 2009, supporting the Xbox 360 and the PlayStation 3, with native support for widescreen HD displays at 1280x720 resolution, a series of achievements for the Campaign and the removal of the quicksave feature.

The game is based on the Return to Castle Wolfenstein game engine. In September 2004, it was accompanied in by an expansion pack named Call of Duty: United Offensive, which was produced by Activision, and developed by Gray Matter Interactive Studios, with contributions from Pi Studios. Call of Duty is similar in theme and gameplay to Medal of Honor, as it is made out of single-player campaigns and missions. However, unlike Medal of Honor, the war is seen not just from the viewpoint of an American soldier, but also from the viewpoint of British and Soviet soldiers, and is not as reliant on stealth as Medal of Honor. Also, unlike many other war games, Call of Duty introduced more computer-controlled allies who vary in quantity, providing the player with support throughout the games offering a more realistic WWII experience. Call of Duty also featured "shellshock" (not to be confused with the psychological condition of the same name): when there is an explosion near the player, he momentarily experiences simulated tinnitus, appropriate sound "muffling" effects, blurred vision, and the action moves slower.