A combination of changes made to the SAI team types assigned to teams.
New assignments in GT5 are:
1.All Tanks and Tank Destroyers changed to HT (10). Command vehicles and other vehicles unedited
2.All Command Infantry, MG's, FT's changed to Assault (3)
3.All other Infantry teams including Engineers changed to Recon (2)
4.Recon, AT Infantry, Sniper, Mortar, ATG, IG unedited
Aggression and Caution values were edited in the bgroups file ... and changes to battle plans in the Campaign.txt
Elements High Grass and Crops more like grass, so that AI teams moved out of these elements more quickly, instead of camping.
And, of course the human player should select Elite and the AI get Recruit or Green