Military Boxes is an article in Resident Evil Recollections. It was uploaded on 20 March 2015.
You've probably opened at least one military box in Resident Evil Revelations 2 by now.
They hold a variety of useful items for the game, which of course means that they aren't going to be too easy to open - you'll need to keep an eye on the visual clues (the controller will give you feedback too) to find the locks.
It's always satisfying to break open one of those boxes though, I guarantee it!
The items inside are such a huge help that you'll want to make sure you never miss any.