best torps : type 95 and type 96...
I think I set the torps to be available from the start...
as for the liberty ships :
http://www.liberty-ship.com/
On January 3, 1941, President Roosevelt announced a $350 million shipbuilding program. In September 1941, the nation launched an emergency ship construction program that would involve building, in just three years, the equivalent of more than half of the pre-war merchant shipping of the world, while during the same time period building the greatest fleet of fighting ships the world had ever seen.