The MK2 "Pineapple" Decommissioned Hand Grenade is an item that is exclusive to The National WWII Museum. This fragmentation hand grenade was used by the U.S. Armed Forces during World War II. Commonly known as a "pineapple" grenade, because of its shape and structure, the MK2 has grooves in its cast-iron shell to aid in gripping the grenade - which give it the appearance of a pineapple fruit.

While in use during active warfare, these grenades were filled with TNT and a small length of safety fuse terminated with a black powder igniter charge. In their current decommissioned state, these grenades are drilled through at the bottom, the explosive powder removed, and are a piece of WWII history.