I just had a weird brain fart (comes of having beer for lunch).
Use an extremely clean (i.e., new?) insulated beverage holder with a spigot. You know, those big orange cylindrical things you see on the backs of construction workers' pickup trucks? If they can keep liquids cold, they should be able to keep them hot. But if this is a more formal event, as Rainee suggested, you may have to come up with another solution.
Or not. It's Navy guys, right?
Kool Aid - Think before you drink.