Jeanette Goldstein, who played Private Vasquez in "Aliens". She was also in "Star Trek: Generations", "Titanic", the third season of "24", and played John Connor's foster mother in "Terminator 2: Judgement Day" (and the shapeshifting T1000 disguised as her, which involved impaling his foster father through the throat with her arm).

She was much smaller than I thought she would be.