I'm impressed by the information I am finding on the Medical Cards I discovered at the NARA. For understanding exactly what an ancestor experienced in the Spanish American War; these cards are a great start; especially when not all service records have yet been released by the VA.
The cards were basically used to keep track of soldiers that were sick or injured and their stay in the hospital all at a glance. They don't offer much information; nothing genealogically relevant. However, from the perspective of understanding the times and family medical history these cards are a gold mine!
Makes me wish I knew a little more medical-ease; so I could better understand the one line diagnosis's and what exactly they meant.