In Battlefield 1943, players were given a free map if they reached 43 million kills. Now they’re doing the same with the Vietnam DLC in Bad Company 2: if players reach 69 million kills, they’ll get a free map called “Operation Hastings”. It will be the fifth Vietnam map.
Considering that it took players only a few weeks to reach 43 million kills in 1943, and that Bad Company 2 has a lot more players, expect the free map to be released fairly quickly. Via Bad Company 2 Blog.