I have a feeling that email that they sent us is a bluff. Two of my Navy classmates didn't submit their scores and have yet to have their stipends cut off.
I know I am preaching to the choir, but in reality, it is very difficult to take both exams before the dates for many reasons. For instance, I won't finish my required clerkships until the end of the summer. Some schools have little leeway as far as when you schedule these and they often run into fourth year. Yes, you can take it before, but studying for the shelf exams helps with the boards, or so I am told. Also, taking time off to take these exams is not always that easy. Some clerkship directors are not very forgiving about missing multiple days--even for residency interviews and exams like this. It would make sense that a lot of us have ATs and AIs scheduled during the most ideal time to take the exam and its not in our best interest to miss that, nor would we get too much study time in during an AT/AI where we're trying to make a good impression. Taking the CS is a huge production in itself and the dates and locations are so limited and require travel time...and money...
With all these catches (and many more that I am not thinking of) it would seem that the majority of us would be missing one exam or another. In am definitely going to try to get the CK in, but if the CS can't get scheduled its tough s***.