Set watch
I have a G Shock DW-004 made in 1997. I had this same problem, and I tried everything to change TO military time and back to standard time. I just read the bit to try and was about to do it. I pressed the top left button to get the time to flash, and hit the light button by accident (the one with the big G on it) and VIOLA! It changed to military time. So in my model, anyway, the G light button (under the display on the edge of the watch body) changed the time to military from standard and back again, when the time is flashing.
Good luck!
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