The military has always been on the forefront of the fight against infectious disease.
https://www.hivresearch.org/about.php?AboutusID=3 (about the military effort to fight AIDS)
http://en.wikipedia.org/wiki/United_States_Army_Medical_Research_Institute_of_Infectious_Diseases
http://en.wikipedia.org/wiki/Walter_Reed
No they have not been. Obama is sending regular military personnel, not medical personnel.