That also brings up something else too. Most of Star Fleets cadet core is gone now. All lost at Vulcan. Those that perhaps would have been alive would certainly not survive the planets destruction. However at the end of the movie the auditorium is full? I would think recruitment would go down if nearly all the cadets lives were lost? Anyway.
Readin' the movie novelization, it specifies that only fourth-year cadets were called into service for the Vulcan alert.
So, think of it as a senior class trip, while the freshman, sophomores & juniors had to stay on campus.
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And like most senior class trips, it ended in disaster...
