In episode 14 of “The Long Way Home” (our military based Twilight 2000 v4 campaign set in Poland and telling the story of some survivors of the US 4-12 Cavalry) the unit continues their skirmish against some Soviet troops/deserters through the ruined village of Sedziszow and we work out the grenade launcher rules for the first time.
The link to episode 14 is here: https://youtu.be/YlXk9-m4F_c