"good to go"

[Mullins, Bill]

 I first heard this phrase 10-15 years ago from active-duty military that I
work with.   Since then I've seen it a few times in civilian / general
usage.  It shows up here:
http://www.dailycardinal.com/news/787868.html?mkey=1483175
(the Nov 1 2004 of the comic strip "Everybody Drunk but Me").

I don't find it in the OED.  If you are "good to go", you are prepared, you
have done everything you need to do to go to the next step.