I like the MOS list. I would leave in Artillery for sure, just include man-portable rockets and small caliber mortars. Logistics, I'm not too sure about. On the one hand, Logistics is the definition of what it takes to make a military professional. On the other, it is kind of boring. It could act as kind of a filter for leadership types. You have to have a high Cha and Logistics as one of your MOSes to be an officer?
I am thinking about campaign settings based on books.
A Final Blackout campaign. http://en.wikipedia.org/wiki/Final_Blackout Pre-Nuc version of a PA world.
A Janissaries campaign. http://en.wikipedia.org/wiki/Janissaries_series Mercs from 1970's Rhodesia kidnapped to an alien world to perform strange tasks for alien overlords. This one would use SWN for the Sci-Fi parts, with a different setting/history.