It's Vietnam, man, Occupational/Workplace Health & Safety doesn't exist.
That's funny, every time I read the title of this thread I see 'Hue river taxi' . . .
Same, so I decided to go with it.
Besides, Vietnam was the Huey's war, Vietnam = UH-1's (or HU-1's, if you prefer
), &, afterwards, even the PAVN was flying them, until they ran out of parts; when they were sold on to the river taxi operators, who added them to their fleets of ex-US service Huey fuselage-based river taxis.