Assertion: grenade launcher | /r/HasProperty | developed
Facets:
value: during the vietnam war
type: TEMPORAL
Source sentences:
text: Underbarrel grenade launchers, such as the XM148 and the M203, both designed as attachments for the M16 rifle, were developed during the Vietnam War, allowing the grenadier to also function as a rifleman.
text: The Mk 19 grenade launcher (pronounced Mark 19) is an American 40 mm belt-fed automatic grenade launcher that was first developed during the Vietnam War.