Welcome to Scamwarners Tasha Sherrod.
There is no known case of anyone wandering about with boxes filled with money needing someone to pay them to move it abroad, let alone someone in the US military. The point of the scam is that if you believe the original story, it's very likely you'll believe anything else he tells you.
US soldiers, like any military, live in a very strictly controlled environment, and it simply isn't possible for them to stash boxes of money because a soldier has no private space and isn't allowed to hold booty which would be thoroughly searched and investigated inside the base, and soldiers only go outside the base, rarely nowadays, on military patrols.
This is a very common story frequently used by West African scammers to steal money from victims. If he did have a box of money, he wouldn't need cash from you. He wants your money to spend in the bar.
CAR ADVERTS - If a car seller mentions escrow - he's scamming you Never ever for any reason pay anything until you have seen and inspected the vehicle