I got about another TWO checkpoints mate, maybe even more, I can't remember as my nerves have gone
COZ I JUST FINISHED THE GAME ON VETERAN!
To be honest i don't even think i did anything in your guide, you know what it's like, you have it in your head what you're gonna do but once things get hectic the plan goes out the window and you just try to stay alive, lol.
This is how i got past the 3rd checkpoint...
Launched a grenade at the two guys in the corridor then stormed in, took out a guy coming from the right then melee attacked a guy coming from the left. I then dropped to prone and took out the guy at the far end of the right corridor then turned around and took out the guy on the left (as you said, this WAS actually quite easy once you get the hang of it). I zoomed along the right corridor and flung a grenade just as the wee baddie was coming out the tunnel, that took care of him, I then flashed the corridor that he came out of and dropped to my knees and took out 3 guys pretty easily. I then went prone right at the entrance to the corridor and picked them off one at a time, when i thought i had got everyone i launched a grenade just to make sure
. At the bottom of this corridor there was a wee prick hiding behind the pillar and he nearly killed me, luckily in my blind panic i somehow managed to kill him
I then looked down the last bit of corridor before the exit stretch and saw 2 dudes, I grenaded them, killing one and i took the other one out with my rifle. I then said **** it and sprinted to the junction were the corridor leads to the doors, luckily i had managed to kill all of the naughties (as far as i know) so i made it no problem.
At this point I thought i wasn't going to get a checkpoint and i was pissed off but next thing i knew . . . .....CHECKPOINT REACHED appeared in the top left corner, I let out a scream of utter joy and the wife nearly shit herself, I then proceeded to jump out my chair and do a silly dance around the living room.
The rest of the level was piss easy in comparison to what had come before, infact the rest of the game was pretty easy in comparison.
I had a look at the Epilogue mission, that looks brutal, I'm not sure wether or not I even want to attempt it.