Where did the phrase 'roger that' come from? - Quora

This one's been really nettling me for some time...there are also a host of links on other similar phrases on here, I've just been meaning to look this particular one up forever, you know? Enjoy...I know it's not intended as humor, per se, of course, I just figured it was one of the easiest ways to get it submitted, I'm looking for other rooms it might be good far, as well...the ones I just typed in here seem the most apt, at least from what I can judge at first glance....