[Noble713]

Take a look at the Default_AI_Construction_Vehicles.txt file.

Of the 6 or so entries, only 2 of them even have transports listed (infrastructure and defense). For infrastructure, it is set to 1 transport per 10 planets and 1 troop per planet. Minimum requirements are 1 transport and 0 troops. For defense, it requires at least 1 transport no matter what, and 1 troop per planet with a minimum of 2 troops.

First , that's nowhere near enough troops to accomplish anything, and probably not enough transports either (not for the AI anyway, a human could probably do ok). Second, these things are so far down the construction queue the computer probably doesn't get to them anyway. Third, neither of the attack AI states has troops or transports listed. THAT's why they just come in and glass our planets. What's the good news? Each and every one of us can play around with this file and report his or her findings (HINT HINT).