Army Spam?

I use Yahoo as my primary email address. In the last few days I've received four or five emails from "army.mil" addresses, and every single one of them ended up in my spam folder. Half of them didn't have a link in them, and none seemed to have words that should flag them as spam.

Now, sometimes non-spam email gets flagged as spam because another address on that server is being used to spam people, but how would emails coming from an Army server get labeled spam?

Weird.