Most EMS jobs are single pilot while most military RW aircraft now are operated with two pilots. In a properly trained crew that extra pilot significantly decreases the risk in the environment where the crews operate (low altitude, high pressure, often flying back side of the clock). Also, I'm not sure how the non-flying crew members are trained in EMS since I don't have that background, but military crew members are trained to be a valuable and vocal part of the crew. I know a CE saved my rear end at least once, especially while flying "a little tired".