Aurora is on version 2.5.0 C#, available at the Aurora Forums.
Contact Erik on the forum for a wiki account.
Ground forces
Ground troops are troops on the ground, unsurprisingly. They provide a reduction in unrest (by, we must asume, shooting dissenters).
In addition, Engineer brigades allow you to exploit alien Ruins, and can assemble PDC elements.
Transport
Individual ground units MUST be manually transported from place to place. It is also important to provide your troopships with sufficient capacity to embark the whole of the formation, you can't have a brigade spread around five troop transports for example.
Combat Drop
Ship Boarding
The ability for drop modules to be shot toward an enemy ship and get infantry onto the hull of that vessel.
Infantry then begin blowing holes into the armor to enter the ship if none already exist.