Tactics in this mod would likely depend on the situation, as some tactics are better suited for certain situations than others, and also it would be dependent on the skill of the regiments members, as inevitably some regiments are far more skilled than others (124thNY/24th FTW).
example: a regiment, made up of veteran players and led by a skilled and aggressive leader might decide to launch a shock and awe assault against a fortified enemy position, however this might end up causing more damage to his the regiment than the enemy, so he decides to split the regiment up into two teams, a fire team and a assault team, while the fire team (aptly named) lays down suppressive fire, the assault team charges forward, until getting into close enough range for grenades, and then closing in for the kill, not only was this manuever extremely effective in taking the enemy fortification, but the regiment took only a few casualties whereas the enemy was annihilated.
In the end, it depends on the situation