Despite being considered too heavy for helo operations quite from the beginning of its introduction, the Gueneau 316 was in some cases used on Sud Aviation Alouette II/ III helicopters,

instead of the standard SPH-4. This might have been a question of "personal choice" of certain pilots.
This specimen was worn by a former Locarno-Magadino AFB commander during many air rescue and fire fighting  missions.

More on tested and swiss Guenau 316 HERE