DICE has hidden a little bit of a sweetener in their new Vietnam expansion for Battlefield: 2 which will reward players collectively for playing the new pack.

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Bad Company 2 Vietnam includes a fifth hidden map within the pack that will automatically unlock when the PC, and communities amass, collectively, 69 million team actions on the four Vietnam levels.

The additional map is called Operation Hastings and was first seen way back on the title Battlefield: Vietnam.

Battlefield: Bad Company 2 Vietnam will be available on PSN, Live Marketplace and for PC from December the 21st for 9.99 GBP on PC and PS3 and 1200 MS points on Xbox 360.

By Ewan Aiton