You are in the military, the US military. You know as well as I that our forces aren't invincible. You have superior training, tactics, and weapons... but that does not necessarily mean they can't win a battle.
Now, certainly, they would all be killed one way or another (by more Americans coming to their rescue by air and probably land too). I just mean the initial attack could be very successful. This is ISIL, not "ISIS" .... they are the top notch fighters for the islamic state. They are former Al Queda...
Not saying it's likely, but it's possible.