Housing Assistants
Particularly in the area of defence of the tower. After all, there's no reason that SHIELD should have been the primary/main beneficiary of all our collective knowledge. We have experts on supernatural and extra terrestrial threats, people with military background, medical... we could become nearly self sufficient, I believe. (Which is not to say I'm ungrateful to SHIELD & Stark Industries, but it never hurts to be able to do something on our own.)
I was lucky that Anne could cover when both Jack & I were gone with SHIELD, but when I found out what happened while I was gone, well, it seemed that we could improve upon a system of coverage.