Trumpetman - Your "AirMed" (one word) reference may have been to one of the 2 (?) helicopters flying medical patients in the Augusta, Ga area. The ground-based critical care transport units use the Gold Cross name.
AirMed / Gold Cross covers several counties in Ga. and S.C., centered around the Augusta, Ga area (including the Augusta burn center, which is a common CCT destination). It would not surprise me that a crew was flying up to Pardee to pick up a burn patient.
Gold Cross / AirMed has a couple of conventional VHF repeaters that I can hear fairly well at home, just south of Charlotte. They also have talkgroups on the Palmetto TRS. I also occasionally catch them operating on some of the local EMS repeaters used by counties along the Ga. / S.C. border.
Med Trans (Greenville) recently added a med helicopter, based in Greenwood, S.C., that will offer some competition to the AirMed system.
Grog - I believe there is a "Med Center 3" designation, although it may be used for the helicopters that are put into temporary use when Med Center 1 or 2 is pulled for scheduled P.M.s. Some of the overhauls, such as every 5000 flight hours, are very extensive.
Like you, Grog, I live along a Med Center Air flightline (to Springs Memorial in Lancaster
). After 10 years here, I can often hear the unique sound and "feel" the thump-thump-thump of the twin engines well before I have a visual of the helicopter.