My various research projects lead me on some interesting trips through photo archives and one that turns up repeatedly is also one of my favorites. It was probably shot in 1947 or 1948 and captured the flight operations team for the Bell X-1, the first aircraft to exceed Mach 1.
This is a companion discussion topic for the original entry at https://www.avweb.com/insider/bob-cardenas-the-x-1s-quiet-driver