TEN PERCENT - GUARANTEED
This piece describes a not-so-well-known perk of deploying to a war zone...the Savings Deposit Program. Soldiers can deposit up to $10,000 and earn a guaranteed 10% APR on that deposit, so long as they remain in the war zone.
I'm pretty certain there isn't another guaranteed 10% out there.
If your soldier has must gone downrange and somehow you didn't know about this...well now you do.