Team Competitions At A School & United States Marine Corps Recruit Training & Ellen Ripley?

I only remember part of my last dream from last night that started at what seemed to be a school gym and I was possibly there as a student with other students including some of my former classmates like my former male classmate MB, my former female classmate LB, et cetera.

We all were divided into different teams competing against each other in various mostly physical competitions like racing et cetera, we could decide who on our team would compete in each competition or we could all compete depending on the competition, and I remember one of the competitions was a speed race back across the gym horizontally; and a short person/student with whitish colored skin with short yellowish colored hair wearing no shoes who we never seen before was chosen to race alone for our team, and I could not tell the gender of this person.