yep, the SO was hubbard's personal army, and now DM's, hidden inside the subject of scientology, which is why it is hard to break apart, legally, and see what it really is.
The only thing I can figure is that Hubbard got the idea of the Sea Org from his reading the book called LAWS GOVERNING LEVEE EN MASSE as he told Heinlein in a personal letter (and , of course, possibly other books):
http://www.forum.exscn.net/showthread.php?38446-Dean-Wilbur-Rhetoric-Hubbard-dianetics-sicientology&p=1058062&viewfull=1#post1058062
I haven't read that book as I can't find it, but what I have found is that Levee En Masse had to do with military conscription and loyalty, hence the Sea Org with it's billion year contract which aligns with hubbards idea of past and future lives. And of course, Hubbard knew he couldn't be a organization with guns, why he used psych ops and thus in the same letter to Heinlein he mention another book called ASSINATION AS A POLITICAL TECHNIGUE, which is basically character assassination to take out the enemy.
Now who is the enemy that hubbard created in his game called scientology, why it's the psych's and governments and everybody else hubbard bad mouths in his lectures.