This study
http://www.dtic.mil/dtic/tr/fulltext/u2/a428688.pdf found found 39 in-flight medical incapacitations for a rate of 0.045 per 100,000 hours on US airline flights.
Clearly these are rare incidents, and worthy of being reported, yet I wonder...a perfectly working aircraft, with a trained and type rated pilot in control, assisted by at least a cpl level pilot with jet experience, who can handle the radio and read checklists...its not exactly the end of the world, as a passenger I would feel perfectly safe and secure (and Im fussy about not letting certain people drive me in a car). Methinks the US airforce overstated the drama just a little bit in their press release...