Tankers!
As you may already have seen in our monumental End of the Year Events Preview, this week's Tech Tree Focus credit boost goes to the American tank destroyer line. Prepare to check every bush, and if you do manage to spot one of these stealthy destroyers, whatever you do, don't blink!
This event starts 03:30 PST December 24, 2012 (11:30 UTC) and runs through 03:00 PST December 28, 2012 (11:00). You can use this handy Time Zone Converter to find out when the event begin in your area.
Bonus credit income: +40%
T82 
T40 
M10 Wolverine 
M36 Jackson 