Classic Battlefield: Vietnam map Operation Hastings is coming to Battlefield: Bad Company 2 Vietnam, but only after a little online teamwork.

Starting Dec. 21 Electronic Arts will start tracking how many times players resupply, revive, heal, spot and repair for one another, once 69 million of these team actions have been amassed the nap map will unlock.

Battlefield: Bad Company 2 Vietnam hits the PC on Dec. 18 and Dec. 21 on Xbox Live and Playstation Network for $14.99 or 1200 Microsoft Points.