Why is Black Ops set in the Cold War?

The FPS market is a crowded one, but one factor that makes Black Ops stand out from the crowd is its rarely-visited setting. With the battlefields of World War II and more contemporary conflicts, the newest Call of Duty puts players on the frontlines of the Cold War.
“The Cold War is something that hasn’t really been done in the Call of Duty series – or games in general for that matter,” Treyarch community manager Josh Olin told MCV.
“A lot of people have this misconception about the Cold War being just that: a cold war. They believe there was no conflict. But while we were researching this, we began to learn about these deniable operations that black ops teams would go on all around the world.
“We discovered these stories of key missions that struck us as fascinating gameplay possibilities, and Call of Duty: Black Ops will really capture that really awesome, intense black operations spirit of the Cold War.”

http://www.mcvuk.com/news/39343/Why-...n-the-Cold-War