IMHO, the issue/problem with electronic medical records (jump drive, smart card, etc) is they are only useful when you arrive at a facility that can read it on a computer. Statistics would show that the major intervention in the field for severe trauma is what sets the stage for ultimate success or failure (yeah, I know, a lot of variables go into that statement....time, distance, level of care, etc) but having a readily accessible medical info "card" that can be read in the field could be the difference between life and death.
An example, read this.....
http://www.tacticalmedicine.com/files/TWMay09.pdf
Now the field issue for the above article I wrote was less important because of proximity to the trauma center, but put yourself in the sandbox, in the rural areas or wilderness where travel /transport times are extended and I would rather have the medical information available to the field medics/docs AS WELL AS the hospital personnel. I think having both would be the best of all worlds: complete medical history for the facility (jump drive , etc) and a brief history that includes meds, allergies, major medical problems, emergency contact info and primary doc (laminated card). I would be happy to post what I use with local law enforcement...every SWAT member and eventually the entire dept. will have a laminated card on them with this info....we have areas that are extremely remote so the USB idea won't be optimal.
ss