We already have orbital Defence Bases, orbital Fighter Hangars, orbital Shipyards.
Bases on Moons, Asteroids.
We are now buildinf 2 x giant Super Space Stations - "egg shaped"
These are 600 Km in diameter, but a bit "taller".
We are gonna put them into place "above" and "below" the mass of the Galaxy - as rallying points, Forward Bases, Fleet Assembly Points, and "invincible" Bases - for long range attacks deep into Zetan Space.
Nearer home - we are 6 Months ( 6 weeks real time ) away from completion of Terraforming Mars, gonna Terroform Venus.
We have loads of Asteroid Bases, Commercial and Naval Shipyards in the Asteroid Belt.
We have just found two inhabited Planets in other Systems
One 200 Million Aliens, Tech similar to ours, but different advantages - Refugees from the Zetans.
One stranger - 1.25 Billion Humanoids in pre-stone age conditions -
refer to "Bordered In Black" by Larry Niven.
Best Wishes - from Kris