Adding none default Militia to a Planet (Capital Ships maybe?)

I have been trying to create my own map with a heavily Militia defended planet being the only access to the star in each system. But I can't get any of the ships i specified in the planet template to show up at the star when I load the map. I tried to model the template for the planet after the default templates for planets with militia but none of it seems to work. Now I tried loading one of the premade maps that comes with the game and all planets that aren't home planets are owned by a none existing player (in my case it was a 2 player map, so players 0,1 and all none home planets were owned by player 3) and I am woundering what that is about.

The idea for the map was to have 5 star systems with 2 starting players each and 2 star systems in the middle with resources. But to get to any other star system the players would have to get past a huge fleet on the only planet connecting to the star in the outer 5 systems, with the defenders including a capital ship. Any help on how to make this possible would be appreciated.