When NEMEXIS tanks and paratroopers enter the city of New Pax , the World Federation seizes the opportunity to disable their army of vehicles with an EMP bomb. Now, JSF forces must fight to the city center before the tanks regain mobility and construct an impenetrable barrier.
— Original map description
New Pax, the UN's new international city was attacked by an anti-government army. Before the armored units are rendered useless by the EMP bomb which has been detonated, drive the units out of the city and safely evacuate the civilians.
BACC is a large urban map, similar to that of Short Fuse. Due to the NEMEXIS invasion, vehicles are sprawled all over the city-like map, similar to the vehicles on the map Roadkill.
This is THE largest map in Combat Arms, even larger than Waverider.
Oddly the original sitrep has since changed, and instead of referencing NEMEXIS directly, simply refers to the attackers as an "anti-government army". This may have been done to avoid confusion at the end of the Evil Never Dies event - however Operation Ghost Town does still reference the antagonist as NEMEXIS.