Vietnam War US Army Illumination Round -
This is a US army illumination round. Used during the Vietnam war to provide light to combat areas. Normally employed to protect the perimeter of a base.

The round consists of an aluminum shell. A timer is placed on the top. It is fired from an artillery piece. The resulting projectile is composed of phosphorus. It burns brightly and descends slowly held back by a parachute.

The tube comes with a piece of paper with instructions written on how to use the round.