Keywords: Vortex Ring Gun Chalk Test.jpg en The image shows the flight of a vortex ring laden with red chalk dust to enable visual inspection of the ability to transport and deposit a particulate chemical agent onto a target 70 ft down range US Army Harry Diamond Laboratories George Kenneth Lucey Jr 1998-07 Toroidal vortices Less-lethal weapons Non-lethal and less-lethal ammunition PD-USGov |