This is a .50 Cal ammo can used by the US Military to store and transport ammunition. The ammo can is able to hold up to 100 rounds of linked .50 Caliber ammo. You secure ammo and items in the can with a latching lid that is removable. There is a rubber weather strip on the inside of the lid to help keep items safe and dry. The carry handle on top easily collapses down for storage.
Markings on ammo cans varies. Markings include .50 cal, .30 cal and High Explosive. All cans are of same dimensions. Please see last picture for examples of differing markings. Used cans ARE NOT painted.