Tom Clancy's Rainbow Six: Vegas

"Tom Clancy's Rainbow Six: Vegas is the fifth game in the Rainbow Six series of video games...

The game's storyline follows a new Rainbow team that is dispatched to Las Vegas, Nevada to defeat international terrorist Irena Morales and her army of mercenaries that is repeatedly attacking key locations in the city...

Rainbow Six Vegas changes the series with multiple new features, such as a new health system where the player regenerates health while not taking fire...The player's vision is greatly impaired while damaged, similar to the health system in Gears of War. Furthermore, a third-person view has been included for moments where players can blind-fire around corners to lay down suppression or covering fire. Other changes include a larger enemy presence and much tougher artificial intelligence, a shift in focus to where kills will be much harder to obtain, a reincarnated aiming system similar to the aiming system of the old Rainbow Six games and a context-sensitive D-pad based command system for the player's squad and sections of gameplay where the player will scale buildings and cause environmental damage. The player can also give voice commands using the Xbox 360 and PlayStation 3 headset, but team-mates are no longer audible through the headset.

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Source: Wikipedia, "Tom_Clancy's_Rainbow_Six:_Vegas," available under the CC-BY-SA License.