Ways to earn units faster are to hit higher levels with your avatar and join extra challenges.
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https://www.ww2.site/forum/viewtopic.php?t=287916
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http://www.lada-xray.net/showthread.php?p=237039#post237039
http://myweed.rocks/viewtopic.php?t=87545
https://www.ww2.site/forum/viewtopic.php?t=288943
https://talkingpoints.org/subx/showthread.php?tid=65164
http://www.lada-xray.net/showthread.php?p=237688#post237688
http://labradory.info.pl/viewtopic.php?f=9&t=16244
http://miweii.com/forum.php?mod=viewthread&tid=51270&extra=
http://tv-online.simple-otr-mirror-alternative.de/phpBB3/viewtopic.php?f=4&t=4873
https://www.ww2.site/forum/viewtopic.php?p=172274#p172274