I would be a chef...
Maybe an ex navy-seal chef on the Bastion, so when the ship gets boarded by the NTF (or Tommy Lee Jones and Chief O'brian) I can single-handedly save the GTVA with nothing but my kitchen knife and Birthday-Cake stripper 'gal.
Undersiege III, it's like Die Hard, but in freespace!
But seriously...
A major share holder in Triton Dynamics

I built the Diemos so I get to ride it.
Or
Alpha 1's co-pilot, sit back, let the guy in front win the war and take half the credit come medal-time. Really I'd just be there for moral support and to keep him supplied with Bosch Beer and such.
Or
Intelligence Spook. Mostly it's standing in the corner of the bridge looking moody, occasionally shaking my head to tell the Captain not to do what he's thinking about doing, not because of any real reason, just messing with him. Then, when the brown stuff really hits the spiny thing just commandeer a fighter using my high-level clearance and get the hell out of dodge.