In addition to Roach, the player will also assume control of Private First Class Joseph Allen and Private James Ramirez of the United States Army Rangers.
Sergeant Foley, along with his subordinate, Corporal Dunn, is initially Joseph Allen's squad leader, and becomes James Ramirez's squad leader later in the story.
The player will also unlock perks, which modify certain gameplay elements like unlimited sprint and increased bullet damage. In the previous game, SAS Sergeant John "Soap" Mactavish killed Imran Zakhaev, a Russian ultra-nationalist who sought to restore his country back to the glory days of the Soviet Union.
Despite this effort, however, ultra-nationalists seized control of Russia and declared Zakhaev a martyr, straining diplomatic relations with the United States.
An expansive multiplayer mode is featured in the game, with several new features and modes that were not seen in its predecessor.
Development for the game began in 2008, when it was still known as Call of Duty 6; eventually, the full title was revealed.
Within 24 hours of release, the game sold approximately 4.7 million copies in North America and the United Kingdom.
Lieutenant General Shepherd is the commander of the United States Army Rangers and Task Force 141.
In 2016, Private First Class Joseph Allen participates in a military operation alongside United States Army Rangers stationed in Afghanistan, by assisting them in taking back a city from insurgents.
In addition to its release, a comic book series based on one of the game's characters was also produced, entitled Modern Warfare 2: Ghost.
When the player is shot by an enemy, blood will splatter their heads-up display (HUD), denoting that they have taken damage; if the player avoids gunfire by taking cover, then their health will recover.