One Point Three is a revitalization mod for the vanilla version of Battlefield Vietnam designed to polish and enhance various features, including adding certain elements of Battlefield 1942 to give this old game a new feel.
The BM-13 Katyusha from Battlefield 1942 replaces the BM-21 Grad on early maps. Here, a Katyusha can be seen near the Ruins flag on Operation Flaming Dart.