When a military veteran dies here in the US, if the survivor requests it, they receive a military burial. It may include a full honor guard, 21 gun salute, and afterwards, the flag that drapes the coffin is carefully folded and presented to the survivor. Usually several of the brass rounds are also recovered and presented along with the flag. The fold pattern for the flag results in a triangular shape. These boxes Barry makes are designed for those flags. If the box has additional space it's so the survivor can mount unit badges, medals, rank insignia, photos, etc. They are quite impressive when done tastefully.