The SDMB is the best place on the net. Good people, good humor and a remarkable ability to stay on-topic.
That being said, I also enjoy Tank Net for their discussion of military matters. I hope you enjoy it as well.
Thanks for the heads-up. Like a lot of civilians, I know next to nothing about the military, so this should be informative. Again, thanks. 
I like the James Randi Educational Foundation meself.
Hard to find a good board.
I’m not active there, but I check the Penny Arcade forums as often as I do the SDMB.