Dug-in Units, officers and their application

[rerathbun]

According to 12.43 (Third Edition) and 12.43 (Fourth Edition), the assault defender chooses: either the Dug-In units use first fire and the other unit doesn't fire at all, or all three of the units fire and it is done simultaneously with the attackers.  The Leaders, of course, affect the combat whichever the defender chooses.  If only the two Dug-In units defend in an assault, all three may still conduct an assault of their own during their activation.