Sorry, Metcalf doesn't ring a bell with me.
How about Frits Hasselman, Stan Franklin, John Turner, Chris van Riet? - all World Wide and then involved with Abu Dhabi Helicopters (as it was originally named before becoming Abu Dhabi Aviation).
Chris and Frits (Chief Pilot of ADH) were both Dutch and now both deceased.
Stan was the GM of ADH and now lives in Gloucestershire in England. I've lost touch with John.
I was hoping to attach some photos but apparently I’m not allowed to! Don’t have time to resolve that just now so you’ll have to imagine a Jetranger on bags in an oilfield in the Arabian Gulf. This was the last World Wide aircraft on the last World Wide contract - for Crescent Petroleum based in Sharjah, UAE in late 1977.