What is a primary function of Electronic Recon?

The primary function of Electronic Recon is to detect and evaluate electromagnetic radiation. This process involves monitoring various forms of electromagnetic emissions, which can include radio signals, radar, and other forms of electronic communication. By identifying and analyzing these emissions, operators can gather intelligence about enemy activities, capabilities, and intent. This information is crucial for making informed tactical decisions and planning operations.

The other choices, while related to reconnaissance in a broader sense, do not represent the central role of Electronic Recon. Visual documentation and imaging with infrared sensors may provide valuable insight but fall under different reconnaissance methods, such as visual or thermal surveillance. Analyzing troop movements pertains more to traditional reconnaissance techniques utilizing ground observation and intelligence gathering rather than electronic means. Thus, option B stands out as the most accurate representation of Electronic Recon’s primary function.