Utah, California, and Romania isn't worldwide.
2 places in the US and one in Europe.
Why would they need civilian medical helos when they have plenty of military Lakotas (250ish), Blackhawks (shit ton), Huey's (another shit ton being replaced by Lakotas) OH/TH-58s, MH-6s etc. God knows how many spare choppers are at Davis-Monthan held in reserve.
Have you looked at all the kit they carry in the back of a medevac chopper. Time and effort required to de-kit it & what would be used to casevac injured civilians?