January 7 is the 7th day of the year
It is also Boomtime, Chaos 7, 3185 YOLD (discordian)
And let us not forget 13.0.6.2.8 by the Mayan Long Count

There were very few grunts on the ground by 1973, so the last episode of Mr. Burns "Grunts of Vietnam" series has to focus on the only place Americans were in the picture (although only slightly at risk): the fall of Saigon. We get 30 minutes on that event, with a lot of coverage of the Marine guards at the embassy.

1. The Fall of Saigon