nobby-w

In Italian pronunciation, gh is a hard G. Gi would normally be a soft G.

Titan was quite a large missile because the W53 warhead was physically large, about 4 tons or so. They needed big warheads as the guidance systems of the era weren't terribly accurate. By the '70s or so, they had much more accurate guidance systems so they could use smaller warheads of a few hundred kilotons yield, which weighed less than 1/10 of the weight of the W53.

The Gemini programme of the 1960s used modified Titan missiles to launch the capsule into orbit. Gemini capsules were manned, which might give you some sense of how big it was. Titan got retired as an ICBM in the '80s or '90s and the Air Force refurbished them, using them to launch large payloads until they ran out some years later. The payloads were normally classified but mainly recon satellites - flying telescopes not much smaller than the Hubble.

I think it's meant to be a Ruritania¹ - some sort of unspecified central European country. I've seen that in other Japanese films as well.

1 - Ruritania was the name of the fictitious setting of The Prisoner of Zenda, and became a generic name for fictitious European countries.