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    I guess "oh dark thirty" is the general term, e.g. 03:30 a.m. would be "Three dark thirty". So "Zero dark thirty" would specifically mean 00:30 a.m. Commented Dec 23, 2012 at 11:19
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    @Oliver_C No, the "zero" or the "oh" is more likely service branch-related. In the Marine Corps, we said "zero"; in the Army, they seem to say "oh." Commented Dec 31, 2012 at 6:50
  • I've been in both mech and light infantry (11B and 11H) as well as a 13D and never did we use that term (CONSUS or downrange). We NEVER used "oh" in place of "zero" as in "zero-one-thirty hrs" for 0130 hrs. When you conduct any sort of briefing or when issuing an OPORDER or a WARNO, never have I used the term nor seen or heard the term used. When you have to be somewhere as per issued orders at a certain time and place, you are told where and specifically when in EXACT terms, grid and SP times. If we were up at an ungodly hour in the morning we normally refer to it as "f***ing early in the mor Commented Jan 4, 2013 at 10:45