Historically, the military has always lost more people to infections than to enemy action. Hence, the military has always been on the forefront of the fight against infectious diseases.
The hospital in Bethesda, Walter Reed, was named after an Army physician who determined that yellow fever is carried by mosquitoes, and instituted mosquito-control measures to protect soldiers from infections.
exDemMom, the military has never been on a biological battlefield, and to the case in point, they never have been deposited in the middle of an ebola contamination zone.
Have surgeons had to fight normal infections in trying battlefield conditions. Sure. Have soldiers succumbed to everything from dysentery to trench foot due to the location and or fighting conditions. Sure.
Those, however, are not biological contamination zones, and I think most people with military experience shudder at the prospect of a biological attack with lethal bio agents, either natural or laboratory created, that have little to zero treatments/cures.
An enemy would direct those agents at our troops who would then have to react to them. The primary principle is to avoid such areas if you are a unit that has not been directly attacked.
So, our president has served in the capacity of enemy by placing our troops in the middle of a lethal biological contamination zone. Were he a commander of friendly forces, he would have had non-affected troops avoid such areas.