Sigourney tests the Flamethrower that would be used in Alien (1979)
NOTE: People are suggesting that the caption is wrong, and the film was, in fact, 'Aliens' (1980).
Truth is...the caption is correct. The picture originally appeared in 'The Book Of Alien'...
...which was published before 'Aliens' was made
It was Dallas who used it in the film, however, not Ripley!