The AT-4 is the American version of the RPG we see the enemy always using, but better. These soldiers under enemy fire made them rethink attacking American soldiers by launching 2 AT-4 rounds down on them. Constant communication and help is important in situations like this, as you see a soldier struggling with a weapon jam and a Sergeant right there to assist them to get them back into action. This type of phenomenal team work is what makes the U.S. military such an efficient and intimidating force.
This is just more proof that in and out of combat our soldiers and their battles turn into family, an indestructible, freedom raining, badass family.