I accidentally found out about five minutes ago that this is trainable by Tactical officers. I have no idea if Engineering officers can do it too, but, it seems to be an error that I, as a tactical officer, can train a high level Engineering skill, even if it is weapons-based.
Secondly and possibly even more importantly, Directed Energy Modulation III is *exactly* the same as Directed Energy Modulation II. Absolutely no difference. One would imagine that it should be stronger, and I must request that it be made so.