Nice little article on pre-Pearl Harbor military actions by the U.S. in WWII

http://thisiswarblog.wordpress.com/2013/01/09/the-war-before-the-war-americas-pre-pearl-harbor-involvement-in-ww2/

The unmanned weather stations is an obscure little bit of military history that I find quite interesting.  And, if I remember correctly, there was a manned station in Greenland for a short while.