Some more examples of US Army CH-34s in N. Italy here:
https://www.usarmygermany.com/Units/...ntico%2012.htm
and
https://www.usarmygermany.com/Units/...ntico%2013.htm
These were of the 202nd Transportation Company, Boscomantico airfield.
The appearance therefore of a CH-34 at Sarnthein part of overall presence of US Army units in that part of N. Italy...
Regards,
Leendert