What are the three frequency bands most commonly used by CEAs?

The three frequency bands most commonly used by Communications Electronics Airmen (CEAs) include High Frequency (HF), Very High Frequency (VHF), and Ultra High Frequency (UHF). These bands are integral to military and aviation communications due to their distinct properties and suitability for various communication needs.

HF is used for long-range communication, allowing for global reach, especially in situations where satellite communications may not be as reliable. VHF is primarily utilized for line-of-sight communication, offering clarity and reduced interference, making it ideal for aircraft and ground station interactions. UHF provides capabilities for both line-of-sight and beyond line-of-sight communications, particularly beneficial for tactical operations and air-to-ground communications.

The other choices involve frequency bands or concepts that are either not primarily communication-focused or not typically listed among the most common bands. For instance, SATCOM pertains to satellite communications, which, while important, is a different category compared to the specified frequency bands. EMCON refers to emissions control, a practice rather than a frequency band. Similarly, COMSEC relates to communication security and does not represent a frequency band. Therefore, the selection of HF, VHF, and UHF encompasses the essential frequency bands used in most communications scenarios encountered by CEAs.