Jace, two questions:

Does your troop require everyone to carry their own FAK. (Not do you, but does everyone else?)

What are they required to carry?

That will determine the quantities you need of the simple stuff.

I'll try to ask my brother if he remembers what he had when he was the medic for his troop.

EDIT: If you epipen is 6" long, it will fit in the Pelican 1030- the dimensions on their website are either internal only or they specify internal and external.