Of what we were able to see in Independence Day, one of the ships was a Troop Transporter, which had a triangular shape to it, with a rounded large sticking out the bottom, and had lines of Harvester soldiers boarding the shuttle, plus when Steven Hiller and David Levinson were escaping from the Colony ship you could see 4 of the exact same ships leaving the colony ship.
When Steven Hiller and David Levinson were flying into the Colony mothership over Earth, they could see thousands or millions of soldiers preparing for an invasion.
