Pawel: Thanks for checking in and the compliments. You're wasting your breath my friend. You're not going to change my mind on the painting techniques. I still don't like the look of preshading and won't use it. To each their own.
As to the TUSK, I'll give a brief description for you. It stands for Tank Urban Survival Kit. It was developed after the initial invasion in Iraq to make the tanks more survivable in the cities as they patrolled them. It includes belly armor against mines and IEDs, side skirt armor against RPGs, armor sheilds around the loader's MG and hatch, a barrel mounted .50 cal MG for engaging non-armor targets with the main gun sight, and day/night sights for the TC and loader's MGs. It is pretty effective and has been added to many (most) tanks used in Iraq.