You can see the edits where the checkpoints were in this mission. There is some choppiness at the points where deaths were edited out. I also edited down a part where I was waiting in a laundry room before exiting. I could have skipped all those enemies in the first checkpoint had I known where I had to go to activate the next checkpoint (through a window). This part took alot of tries. There was probably 3 or 4 checkpoints, so that made it more managable. Definately not the fast way to beat this section. Checkpoints seem to be triggered only sometimes when you successfully evade enemy attention at certain parts. This was the hardest part of the game on this difficulty.