Engineer battalions were named for a lake if they supported a corps or named for a river if they supported a division or brigade: i.e. the 5th Pioneers Battalion "Bolsena" supported the 5th Army Corps, while the 104th Pioneers Battalion "Torre" supported the Mechanized Division "Mantova". In the case of the 184th Pioneers Battalion "Santerno" the name was chosen to also commemorate the CLXXXIV Engineer Battalion's role in crossing the river Santerno during the allied 1945 Spring offensive.