A term used on Drum Corps International judging sheets that categorizes the highest level of achievement a corps or individual corps section can attain. Box 5 is not only used by corps members as a general phrase for performance related classifications but in everyday usage as well.
-The Carolina Crown color guard showed Box 5 execution at the World Championships. Their performance was nearly flawless.
-The tuna sandwiches for lunch today were totally Box 5. I could have eaten at least three of them!