The units talk back to you, but have a limited range of samples that quickly become tiresome. It certainly doesn't evoke the kind of immersion that TA managed so well. Some will be familiar to players of the previous games in the sequence. The basic infantry types make another appearance, along with the harvesters, artillery and so on with which you're probably familiar if you've played any of the Westwood strategy games. But among the many new arrivals are various types of walkers that replace the smaller GDI tanks, rocketpack infantry and hover tanks.
Helicopters also make a return, joined by a new helicopter bomber, highly effective in large groups.
And the more sneaky players will be pleased to hear that engineers feature for both sides, and have gained the ability to repair bridges. GDI has the Mammoth Mk. Nod gets a cyborg commando with an awesome weapon, capable of decimating infantry, vehicles and buildings alike and making very short work of enemy bases. He's capable of soaking up enormous amounts of enemy fire. Much like the marine from Quake , really.