The mission is designed, and scripted to deliver an immersive Vietnam experience (which all the feedback I've gotten so far, says I accomplished). So, the only reason you would have to sit through the intro again, is if you decide to re-play the mission. The mission play through time is only about 40-50 minutes, so it's quite easy to play all the way through at one time. The intro is not skippable, but you only have to go through it once, the game auto-saves after the intro, and before you are at any risk of dying.
Out of curiosity, is the intro skippable? Having to sit through an over a minute long intro all the time sounds a bit painful.
