USGI Olive Drab 40mm Grenade VestThe Vietnam War bought in a whole new war to launch grenades at the enemy in the form of the standalone M79 or the rifle mounted M203 launcher. It was common to have a man in a section as a grenadier toting nothing but a 'thumper' and dozens of different 40mm grenades. There were bandoliers at the time but these weren't ideal to draw from in a hurry let alone the snagging in the bush they could cause. Eventually the military designed and started