Direct homage to Daicon III and IV, two short movies made as openings movies for the Nihon SF Taikai (japanese sci-fi convention) that happened in 1981 and 1983 in Osaka (the name of the convention changes in acordance to where it takes place, e.g. Osaka is known as DAICON, in Tokyo is known as TOKON).
Those opening animations are the first major exemple of anime made by fans to fans, paying homage to the pillars of otaku culture at the time: anime, manga, tokusatsu, sci-fi movies and even western comics.
I think those animations are what cemented otaku culture as a cultural moviment and, since I'm a massive otaku, I think is only fitting I should pay tribute to what was one of the definig moments in otaku culture.
The people who animated the Daicon Opening Animations would later form GAINAX, the first animation studio created entirely from scratch, not being a tied to any major studio (almost all of animation studios were created by ex-employees of bigger studios) and pioneered the medium with anime like The Royal Space Force: Wings of Honneamise, Gunbuster, Neon Genesis Evangelion, Nadia: The Secret of Blue Water, FLCL and many others.
We could also say Daicon IV was the first AMV to exist (fan made video combining anime and licensed music), but even I know its a stetch.
Also an accidental nod to Metal Gear. Otacon derives his nickname from the Otaku Convention so, in a way, we both homage otaku/nerd/weeb conventions.
"Spc" is just "Space" without vowels, a nod to the sci-fi origins of the convention.
If any of my ramblings peaked your curiosity, you can easely find both animations on YouTube