Input (grade 13): He held several senior positions in the Royal Flying Corps during World War I, serving as the commander of Royal Flying Corps in France from 1915 to 1917.
Output (grade 10): He became the second most important man at the Central Flying School in England and had several important jobs in the Royal Flying Corps during World War I. Trenchard was the man in charge of the Royal Flying Corps in France from 1915 to 1917.