text: there is 
  a probable spectrum of loads which the air- 
  craft will encounter. That is, various loads 
  will be encountered with a frequency particular 
  to the mission profile. The fighter or attack 
  type of aircraft usually experiences a pre- 
  dominance of maneuver loads while the trans- 
  port or patrol type usually encounters a pre- 
  dominance of gust loads. Since fatigue damage 