ISTR that most TDM races have lowered ground combat scores as well... I used to increase my ground combat strength, until I decided I'd just go with larger troop transports (or avoid the whole invasion thing - sometimes you just want to eradicate the enemy rather than deal with assimilation).
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L++ Se+++ GdY $++ Fr C+++ Csc Sf Ai AuO M+ MpTM S Ss RRSHP+ Pw- Fq->Fq+ Nd+++ Rp G++ Mm++ Bb---
It sure would be nice if we had some sort of 'strategy' choices in ground combat, wouldn't it? Say, the choice to tell our troops to 'dig in' and defend instead of attack so they can survive longer while waiting for reinforcements?
Practical Answer:
The closest we currently can come to that is, (I think SJ or Geo suggested),
Create Heavily Armored / Shielded troops
Load them onto the transport first
Creat Heavily Armed troops
Load them onto the Transport Second
"Real Explanation"
Based on "hear say" that I could never confirm:
A trined bulldoazer driver with a large enough blade in soil with no boulders
could push up a "Wall of Dirt" 10 yards wide sufficient to use as cover for infantry in in 2 to 4 minutes. That of course is if no one is shooting at him.
Using 1/285 miniatures and 30 second turns, there never seemed enough time to prepare that kind of defence in a "Meeting Engagement".