It was not in the original theatrical release, but has since appeared in deleted scenes and extended editions.
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Sample:
P.J. Soles topless in a scene deleted from Stripes (1981)
Other Crap
Uncle Scoopy's world-weary musings about naked celebrities, sports, humor and other important, manly things.
She was hot as heck and one of the girls Bill Murray really wanted to get in bed with but he batted zero. She had a boyfriend at the time Stripes was made & was 100% faithful to him.
And she’s still super cute at around 70. Very, very sweet lady, too, from what I hear.