During a yellow alert, what must never be used?

During a yellow alert, the primary concern is ensuring the safety and security of operations, particularly in situations where there might be a potential risk or threat. The use of equipment that could cause interference or distractions is heavily scrutinized.

Wired headsets, especially those used in specific operational contexts like air traffic control or ramp operations, could potentially be a source of distraction or misunderstanding among ground personnel, particularly in critical situations. The use of particularly any electronic devices that may not be necessary can detract from full situational awareness during heightened alertness. Hence, while communication is vital, in this context, avoiding wired headsets is crucial to maintain clarity and focus.

In contrast, wireless headsets, two-way radios, and personal mobile phones might have their roles during yellow alert conditions, provided they are used in a way that enhances communication without adding to confusion. Wireless and mobile devices can often allow for more flexible communication while not being as tethered, depending on the situation at hand. Therefore, wired headsets being prohibited during a yellow alert underscores the importance of maintaining clear and unobstructed communication methods and minimizing potential distractions among personnel.