Its better known as the "Bazooka Vespa"
"After World War II, there was little money for defense spending while the nations of Europe rebuilt their industry and society. When there was some cash to spend, one had to be creative to stretch it as far as possible. The French probably accomplished the most astounding example of that with the
ACMA Troupes Aeról Portées Mle. 56. Deployed with their airborne forces, this was essentially a militarized Vespa scooter outfitted with a 75mm recoilless rifle. Five parachutes would carry the two-man gun crew, weapon, ammunition, and two scooters safely to earth, and the men would load the weapon on one scooter and the ammo on the other, then ride away.
More impressively, the recoilless rifle could be fired effectively on the move by the best of the gun crews. Total cost? About $500 for the scooter and the recoilless rifle was war surplus. Were they successful military machines? Well, the French Army deployed about 800 armed scooters in wars conducted in both Algeria and Indochina."
More:
"The Italian made Vespa motor scooter took Europe by storm in the early 1950s and was subsequently made under license in many countries. In France the Vespa model 150 was assembled by ACMA and sold commercially. They offered the simple and economical machine to the French Army for testing in hope of a contract. The offer was accepted and nearly 2000 of the Vespa scooters were accepted from 1956-59 in three different models. One was a basic scooter to be used for general purposes, one was to carry a 81mm mortar and its rounds, and the third carried a six-foot-long US made M-20 75mm recoilless rifle. Each of the models used the same basic frame, 11hp air-cooled 250cc two-stroke gas/oil mix engine, three-speed transmission, 8-inch wheels, and could travel at speeds up to 60mph (100kph) for 200 kilometers before having to refuel.
In operation five parachutes would drop two scooters, a recoilless rifle, 16 twenty pound rounds of ammunition and two paratroopers.
On the ground they paratroopers would load the rifle on one scooter with six rounds,
the other ten rounds on the second scooter and cruise away into combat like a well armed tourist in a post-apocalypse Rome. The Vespa’s M20 recoilless rifle had a range of 6900 meters and penetrate the armor of a Soviet T34, the most common tank of the day. These military scooters were used with French Parachute units in the Suez campaign, Indochina (after the end of direct fighting but before the eventual French withdrawal in 1957), combat in Algeria (until 1962) and cold war service with NATO facing down the potential Soviet threat to Western Europe. The Vespa was phased out by the mid 1970s and replaced by larger vehicles."
