I'm playing Call of Duty 4: Modern Warfare, level No Fighting In The War Room. I read a lot of walkthroughs, but couldn't solve the problem.
First of all, you start as Soap MacTavish, with your teammates: Captain Price, SSgt Griggs, and Cpl Miller. The latter is is not mentioned in any walkthorugh I saw. He is a real coward, and engages in almost no fight. Despite this, he gets killed no matter how I try to save his life.
Anyway, I continued the level till I reached a corridor where crates blocked the road. There were two entries to my left and right, each leading to parallel side corridors. I entered each of them and killed every enemy. Oddly enough, neither Captain Price nor SSgt Griggs followed me.
After that, killing all enemies in side corridors, I took a path leading to the main corridor (bypassing the wooden crates which blocked the road). At the moment I set foot on the passage joining the side corridor to the main one, an alarm set off.
I sprinted to the main corridor, meeting Price & Griggs! They were running towards some giant door. No matter how fast I ran, just before entering the door, something exploded, and I was dead!
This explosion is not mentioned in any walkthrough. I think it might be related to Cpl Miller's death, but I'm not sure.