Which feature is essential for the effective employment of the 81mm mortar in combat?

Mobility is essential for the effective employment of the 81mm mortar in combat because it allows for rapid repositioning of the weapon system to respond to changing battlefield conditions. Mortars are typically used to provide close support for ground troops, and their effectiveness is greatly enhanced when they can quickly move to different locations to avoid counter-battery fire and to engage various targets. A mobile mortar unit can also take advantage of terrain features for cover, making it harder for the enemy to pinpoint their location.

Additionally, mobility allows mortar crews to deploy quickly and support maneuvering forces effectively. The ability to quickly set up and fire, followed by immediate relocation after firing, is crucial in maintaining operational effectiveness and survivability on the battlefield. In contrast, while stealth, high elevation, and invisibility may offer advantages in certain scenarios, they do not directly contribute to the fundamental capability of a mortar in terms of its operational use in a dynamic combat environment.