Helicopter Rope Suspension Technique (HRST) is a military term for techniques and methods of rappelling, fast roping, Special Patrol Insertion/Extraction

Special Patrol Insertion/Extraction

The Special Patrol Insertion/Extraction system was developed as a means to rapidly insert and/or extract a reconnaissance patrol from an area that does not permit a helicopter to land. SPIE has application for rough terrain as well as water inserts/extracts...

(SPIE) and Jacob’s Ladder operations. Helicopter Rope Suspension were developed as a means to insert and/or extract, by helicopter, ground forces (primarily reconnaissance teams) into or from rough terrain, urban areas or water. HRST is designed to be used in situations where aircraft landings are impractical due to terrain or tactical situation.