O'Dark Thirty: (V.) Army Milspeak.
A measurement of time in the United States Army. O'Dark Thirty is usual reserved for the period between midnite and sunrise, which always is the coldest,wettest,darkest and shittiest of the year. It is also, without exception, the time of day when no sane Human Being would be found awake and/or sturring.
Q: "What time is First Formation?". A. "O'Dark Thirty; Same as always".
First Sargent's Time: (V.) Army. Milspeak for a unit of time, dependent upon the judgement, wisdom, capriciousness or stupidity of the Company First Sargent.
As a unit of measurment, First Sargent's Time is infinately more accurate than the US Atomic Clock because the US Atomic Clock can be off a second in 10 million years, whereas FIRST SARGENT's TIME IS NEVER OFF AND NEVER WRONG, despite all logic and evidence to the contrary.
"Until all this shit is picked up and put away, we are all on First Sargent's Time, Peoples!!!"