GM/Delco were very diverse in manufacturing, so I'm not surprised that they also made missile components at one point. At one time they owned Frigidaire too.
Motorola made "MTTL II" which had 20xx part numbers for commercial temperature range and 21xx for industrial/military, so these could be Signetics' variant of that. In the late 60s through the 70s semiconductor companies made lots of different logic families.
I've always found it a bit sad that the ultimate purpose of things like this was for destruction.
Thanks for the part number info; that's a good lead and I'll see if I can track anything down.
As far as your last point, I basically agree. This computer, though, is not quite as bad as it could be. It was a later, 1970s model originally designed for the Titan IIIC rocket to put satellites into space, a more positive role. It was also closely based on the Carousel IV commercial navigation system used for aircraft such as the Boeing 747, which is a nice heartwarming application.
Edit: the Motorola 21xx parts have the wrong pinout, e.g. ground on pin 10 vs 11. And many of the numbers don't exist as Motorola parts. Unfortunately, I don't think these are the right parts, although it seems so close.
Motorola made "MTTL II" which had 20xx part numbers for commercial temperature range and 21xx for industrial/military, so these could be Signetics' variant of that. In the late 60s through the 70s semiconductor companies made lots of different logic families.
I've always found it a bit sad that the ultimate purpose of things like this was for destruction.