What is NOT a type of tactical single channel frequency band?

The correct choice is infrared frequency, as it is not categorized as a tactical single channel frequency band. Tactical communications typically operate within the radio frequency spectrum, which includes high frequency (HF), very high frequency (VHF), and ultra high frequency (UHF) bands. These frequency bands are widely utilized for their transmission range and characteristics suited for various military operations and communications.

High frequency bands are known for long-range communication capabilities, including over-the-horizon capabilities. Very high frequency bands are typically used for line-of-sight communication and provide clear signals for troop-level communication on the battlefield. Ultra high frequency bands extend this capability further, being used for more localized communications and improving signal clarity in a variety of tactical environments.

Infrared frequency, on the other hand, operates outside of the radio frequency spectrum and is generally associated with thermal imaging or optical sensors rather than traditional radio communication channels. This distinction helps clarify why infrared frequency does not fit within the parameters of tactical single channel frequency bands commonly used in military applications.