Mentioned by Michel Houellebecq in his novel "Serotonin" published 2019.
The most successful movie released in France in 1971. Constant re-releasing of other movies over the years such as 'The Aristocrats' etc may have changed results but in 1971, it out-grossed all of the movies released that year.
Half of the movie happens outside of the boot-camp, despite expectations.
The footage with all the leads hanging shirtless upside down while making grimaces, shown in the trailer, is not in the actual film.