Dug-in Units, officers and their application

[cjsiam]

So picture a couple infantry dug-in....there is an officer (he defaults to dug-in)...
Then there is another friendly infantry NOT dug in who joins the hex....

There is this terrible assault on said hex...

So---the Defenders can:
1) Roll first-fire with two infantry and officer
then
2) Roll single simultaneous fire with the attacker....

What about the officer? Can he be counted in 2) as well as 1)?

Inquiring minds......

Also, it is true that the defender gets both the First-fire (with the units dug) in AND the simultaneous?
he does not need to choose ONE or the other?

We've been playing the 1) 2) above---officer doesn't get to do both....
thanks!
cj