Previously mentioned in another thread the story of the formation of the Royal Air Force in 1918 adds to this saga.
Trenchard (not sure if he was Lord by then ) wanted the title "Marshall" for the top job in the fledgling service.
He was heavily opposed by those pointing out that this title was only given to the elite,
Field Marshall, Marshall de France e.t.c
His response was two words, Provost Marshall. He won the argument.