Looks like it was used in Algeria, actually, according to this source:
"La Vespa 150 TAP o "Vespa Bazooka" como la llamaban algunos tuvo su bautismo de fuego durante la guerra de Argelia (1954-62), en que varios cientos de estas motos fueron desplegadas y utilizadas por las TAP y la Legión Extranjera." [1]
Googla translation:
"The Vespa 150 TAP or "Vespa Bazooka" as some called it had its baptism of fire during the Algerian war (1954-62), in which several hundred of these motorcycles were deployed and used by the TAP and the Foreign Legion."
I haven't found other sources, though.
[1] https://laescaleradeiakob.blogspot.com/2013/12/la-vespa-150-...