Which of the following is NOT a type of decompression?

The correct answer is that "Complete" is not considered a type of decompression in the context of aviation physiology. In the study of cabin decompression, the commonly recognized types are explosive, rapid, and slow decompression.

Explosive decompression occurs abruptly, often due to structural failure of the aircraft, leading to a rapid loss of pressure that can have immediate physiological effects on passengers and crew. Rapid decompression is a more controlled but still quick loss of cabin pressure that can still negatively impact bodily functions but usually happens over a slightly longer timeframe than explosive decompression. Slow decompression, on the other hand, occurs gradually, allowing more time for the body to acclimate to the changes in pressure, which can mitigate some of the physiological effects experienced during rapid or explosive decompressions.

"Complete," while it may be used to describe a scenario where decompression is total or absolute, does not fit within the standard classifications of decompression types that are critical for understanding physiological responses and safety measures in aviation. Thus, it stands out as the correct answer to the question about which is not a type of decompression.