I've only been designated "Lifeguard" once, it was for the same thing, carrying human eye tissue. It was kind of nice though......we took off out of MSP and somewhere over downtown Minneapolis we were cleared direct PVD (Providence, RI) . Of course, since we're just a little regional carrier the mainline ground crew in PVD wasn't in a big hurry to get this eye from off the airplane....as a matter of fact, they didn't even know it was coming......oh well.