With the previously established material and the fact that most people's ships early on are their homes, and larger crews are just their family, one possibility is that GC is where the minors and noncombatants were kept out of the line of fire while their ship was part of the operational fleet. Not in every case, of course, but for a number of them... it would also be a rationale and precedent for setting up a school there which more than just your group's own kinder attend.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows