AHN LifeFlight, Pittsburgh, Pennsylvania; and Allegheny General Hospital, Pittsburgh, Pennsylvania.

Correspondence: Cassandra Asberry, BA, EMT-P, NRP, FP-C, Allegheny General Hospital, 320 E. North Ave, Pittsburgh, PA 15212 ([email protected]).

The authors acknowledge Jim Palafoutas for his assistance in locating archival photographs.

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

The authors report no conflict of interest during the conduct of this study.