PAC are not terrorists, actually. They are more like a 1st generation military. Low-tech but somewhat organised. As for the US, or UNITY actually, they're adaptable. Many of their units perform multiple roles via upgrades and by doing so, they can counter many types of units with the same unit.
Hope this answers your questions.
CoLT//C&C:RM
John joined
"Only the dead have seen the end of war." - Plato "I respectfully disagree. Only the charred, dismembered or crushed have seen the end of war. Their bodies and brains will be of no use to us." - Dr. Wilhelm Spieler