Original sentence: Langleys first executive officer, Kenneth Whiting, had an early hand-cranked movie camera film every landing so everyone might evaluate the strong and weak points of technique.Pilots found Commander Whiting's body language helpful and suggested an experienced pilot be assigned to occupy that position using agreed signals which evolved with experience
Edited sentence: Langleys first executive officer, Kenneth Whiting, had a hand-cranked movie camera film every landing to aid in evaluation of landing technique.Pilots found Commander Whiting's body language helpful and suggested an experienced pilot be assigned to occupy that position, using agreed signals which evolved with experience