sentences:  The "RPára" is part of the Rapid Reaction Brigade that includes other elite units like the Army Comandos and Army Special Operations.Like other Portuguese Airborne units, the troops of the School are nicknamed ""Boinas Verdes"" (Green Berets) while recruits are nicknamed ""Catatuas"".After the successful use of airborne forces in the Second World War by Germany and the Allies, other armed forces began to examine the possibility of forming parachute Troops for special missions.