Squad Leader
From Avalon Hill
WW II, Tactical Level board game, played on geomorphic maps that can be set together to depict just about any type of terrain in the world. Thousands of historical scenarios, involving every major and minor combatant have been published. Some 15 add-ons it boasts over 2000 playing pieces. 200+ pages of rules, 42 boards, and 60 or so charts make it the most complex war game in existence .and probably the best.