That's normally the answer to all orders given to the fliers in the day room of "Flight Commander". It signifies neither assent or disagreement, just obedience to official orders. You have to watch the face or listen to the tone to decide whether the recipient is enthused, annoyed or resigned. Such is life on the western front of an RAF outpost during WW1 - and where life is a fragile commodity.
Also known as "The Dawn Patrol", it was remade in 1938. That's the one I knew from Million Dollar Movie on Ch. 9 in NYC, and it would play for a whole week. I loved it and watched it as often as I could. I thought no one could beat Errol Flynn and David Niven in the two lead roles, until I saw the original, "Flight Commander" which starred Richard Barthelmess, Neil Hamilton and Douglas Fairbanks,Jr. (Basil Rathbone played the Neil Hamilton role as Commander of the doomed fliers in the '38 version). The acting was far superior in the earlier version, but the later one had better production values. It seems some of the same great aerial footage was used in both films.
If I had to pick one, I like this (1930) version better as it was emotionally more satisfying; it had more 'heart'. And Richard Barthelmess was an excellent actor who for some reason couldn't last in talking pictures. I also thought this may have been Fairbanks' best acting job. Well, that's my take on the two films, and that's the best part of going to the movies - it's often subjective, and there's no accounting for taste.