Ghost Recon Desert Siege enemies

Campaign

D01 Burning Sands

D02 Flame Pillar

As you see that the enemy soldiers in the mission D02 Flame Pillar you see they are same as in the  D01 Burning Sands.

D03 Cold Steam

Now you can see that the enemies look a bit different with sunglasses in forward missions from the 3rd mission D03 Cold Steam

And some of them wears tank headgears

D04 Quiet Angel

Enemy soldier in Rocket Launcher site 1.

Here you'll see an enemy soldier carrying rockets on his backpack as long the convoys come he will take out the rocket launcher and launch on the convoys and the mission will be failed and over.

Enemy machine gunner in the D04 Quiet Angel

Enemy soldier in Rocket Launcher site 2

D05 Gamma Dawn

D06 Spectre Wind

Ethiopian enemy soldier protecting warlord Ashenafi Abate

D07 Subtle Keep

D08 Torn Banner

Quick Mission version

If you are in the Quick mission you see that they look same as in the beginning but with no sunglasses or tank headgear. Screenshots I took from the custom mission in the mission DP05 Ravine which is a non campaign version in the Quick Mission menu.