While the pop up does sound weird, your explanation doesn't make any sense. The Air Force would not be trawling for random email addresses in this way. There's no way to ensure that you'll be reaching 18-30 year old people with two legs and at least a high school education, which is all they're interested in. It sounds more likely that the "creepy orange cat" is an online greeting card of some kind. Do you know anyone in the Air Force? Or else that it's actually from an ad agency of some kind, looking for emails to send ads to; maybe the Air Force is just one of their clients. Or maybe there's a new brand of jeans called U.S. Airforce...I wouldn't put THAT past anyone, either...