text: The combination of the angle of attack in- 
  dicator and the mirror 
  landing system can 
  provide an excellent referetice for a landing 
  technique. The use of the angle of attack 
  the 
  indicator will provide the airplane with 
  proper airspeed while the mirror system refer- 
  ence will provide the desired flight path.: When 
  shipboard operations are conducted without 
  the mirror system and angle of attack indicator, 
  the landing signal officer must provide the 
  immediate reference of airspeed and flight path. 
  The LSO must perceive gnd judge the angle of 