B525 Share On... by randall posted November 25, 2020 United Rotorcraft Multi-Patient Stacking System (MPSS) is a proven multi-mission solution utilized by the U.S. Army and NATO Allies allowing the operator to reconfigure the aircraft in flight as the mission changes. The MPSS is capable of transporting up to four (4) critical patients and includes an integrated seating system for ambulatory or troop transports. Download Brochure