Six Days in Fallujah

I imagine someone has brought it to your attention. But a very common problem is the IED's bugging out and unable to disarm in the Sniper mission to free Beowolf.

Can someone provide some detailed clarification on how the ranking system works? how do you make progress through ranks and how much do optional objectives affect progress? Do blue on blues affect progress adversely? Any details would be great.

1.) Today I jumped a fence that was totally enclosed on the other side with no doors or way out. I got wounded through a barred off window and was too injured to climb the wall again and get out. The only way out was to grenade myself and have my team get me from the AAV.

2.) The AAV got stuck on a ...