The M19 was favored by the Marines — even though 10 pounds heavier, shorter-ranged and less accurate than the M2 — because it had sights and a manual trigger that enabled the crew to aim it at ...

Top-down view of the Cloud Leopard II M2 Mortar Carrier prototype, showing the 81/120 mm Mobile Mortar System in its deployed position and the UAV Forward Observation System on its right roof-hatch.