Dust to Dust:
Most of veteran is pretty easy but this was the only level I had a few deaths on. It wasn't until after the elevator scene and the timer countdown starting.
Once you are on the second floor (where your timer starts), you might struggle moving from area to area with the sheer amount of people. Luckily you don't have to. If you spend about a minute or two taking out the majority of baddies on the floor a checkpoint will hit.
A good place to take them out is when you just leave the elevator and hide behind crates right next to the balcony. I stayed here for the whole time.
After this checkpoint a new wave will run through and take them out from the same point. You don't need to save any grenade or anything after this point so just spam all you can at everything. After this another checkpoint will hit. You can now move forward with no real trouble.
(if the second checkpoint doesn't hit then go into the casino table room on the left and take out the guys that come in after the civilians run through then head back to where you were)
Moving forward I'd stick close to the second bar and take out the last one or two guys that run towards you before the helicopter attacks. Walah - it's plain sailing from here.
Hope these tips help those struggling :)