The document is a 1983 declassified report by the U.S. Army analyzing the 'gateway process,' a method for altering consciousness through brain hemisphere synchronization (hemi-sync). It discusses various techniques such as hypnosis, biofeedback, and transcendental meditation, providing a scientific framework to explain their mechanics and the nature of consciousness. The report emphasizes the practicality of the gateway experience and its compatibility with existing belief systems, suggesting it can be a useful guide for personnel training in this area.