This is a World War I signal rocket and was fired from a rocket tube to a height of 1,000-1,200 feet. The signal cartridge payload was then automatically ignited and ejected and slowly lowered by a parachute so that the signal burned for about 30-40 seconds. This specimen is marked "Green" on its label and therefore had a green signal.

Signal rockets and resembled ordinary firework rockets and used gunpowder. This specimen has a guidestick socket but lacks its long wooden guidestick. The green light conveyed certain signals by pre-arranged codes. Signals included commands like "Advance to the right (or left)," and so forth. This object was donated to the Smithsonian in 1996 from the U.S. Army Ordnance Museum.