The unusually unique KATV sign off at the 2:50 mark. It looks like the KATV ABC7 station manager, and he's delivering the sign-off message on camera. Usually a voiceover announcer reads the signoff over station logo and visuals of coverage area.
And then it goes into the Mormon's SSB film...but with one anomaly...the flag in the opening shot is reversed. The stripes usually go from left to right. KATV has them right to left...making me think this was an in-house video for KATV. I think I read somewhere online KATV used the Mormon's SSB film.