Qatar, Philippines and Botswana. Italy later used the motor of the SNORA rocket as the basis for the development of the 81-mm Medusa rocket. Variants Designation HE FRAG: High Explosive Fragmentation HE-I: High Explosive - Incendiary HC: Hollow Charge (HEAT) MKR: Marker TNG: Practice References Swiss Military Museum Full Notes Citations Air-to-ground rockets Artillery of Switzerland Oerlikon-Contraves Rocket artillery Military equipment introduced in the 1980s