The term Panzergrenadier had been introduced in 1942, and was applied equally to the infantry component of Panzer divisions as well as the new divisions known as Panzergrenadier Divisions. Most of the Heer's PzGren. divisions evolved via upgrades from ordinary infantry divisions, first to Motorized Infantry divisions and then to PzGren. divisions, retaining their numerical designation within the series for infantry divisions throughout the process. This included the 3rd, 10th, 14th, 15th, 16th, 18th, 20th, 25th, and 29th divisions.