Bam boom minor errata time; It's been pointed out to me that sometime between Update 2.2 and Update 3.0, the Artillery Spotter's Aptitude array was deleted from Volume 2. Not entirely sure how that happened, but here it is;

Agility, Intelligence, Fellowship, Fieldcraft, Leadership, Offense, Perception.

If you find any more errors like this, please let me know. And thanks to Thestalker for finding it and pointing it out.