Aces High is based on a play called 'Journey's End' by R.C. Sheriff.
The play is about disillusionment and how British Officers feel in the lead up to the big German offensive on 21st March 1918.
The Journey really is at an end because tomorrow Jerry 'comes over' and life (should it continue) will never be the same again.
I believe I once saw a TV play of Journey's End with the British actor David Warner in the lead role.
Never been able to track it down since though.