Which of the following is NOT a method of reconnaissance for mortars?

The correct choice highlights that drone reconnaissance is not traditionally categorized as a method of reconnaissance for mortars. While drones are increasingly used in modern military operations for various forms of reconnaissance, including gathering real-time information about the battlefield, they are not specifically listed as a classical method for mortar reconnaissance in many tactical manuals.

Mortar reconnaissance typically involves other established methods. Map reconnaissance involves analyzing topographical maps to identify terrain features and potential targets, which is critical for effective mortar placement and targeting. Air reconnaissance usually denotes using aircraft or aerial platforms to gather intelligence over larger areas, assessing enemy positions, and gathering situational awareness. Ground reconnaissance entails on-the-ground scouting to collect information directly related to the environment or enemy positions, crucial for mortar units to adjust their fire accurately and safely.

While drone technology has certainly revolutionized reconnaissance capabilities, it has not yet fully displaced these traditional methods in the context of mortar operations, which is likely why drone reconnaissance is viewed as a less conventional element.