MCO P1070.12K W CH 1 MARINE CORPS INDIVIDUAL RECORDS ...

IRAM 6002
(c) If the number spelled out ends in the letters
"th", the Arabic numeral is used followed immediately by the
letter "th" Example: Fourth becomes 4th.
(2) Dates and Military Grades. When abbreviating dates
and military grades the following rules apply:
(a) If the number spelled out ends in the letters
"st", the Arabic numeral is used followed immediately by the
letters "st" Example: First sergeant becomes 1stSgt.
(b) If the number spelled out ends in the letters
"nd", the Arabic numeral is used followed immediately by the
letter "nd" Example: Second Lieutenant becomes 2ndLt.
(c) If the number spelled out ends in the letters
"th", the Arabic numeral is used followed immediately by the
letter "th" Example: Twenty-fifth becomes 25th.
k. Military organizations/Activities/U.S. Government and
DoD Agencies
(1) Puncuation and Spacing
(a) Normally, punctuation (i.e., periods, commas,
etc.) and spacing are not used with military abbreviations and
acronyms; the letters are run together, without separation by
space or punctuation. This run-together rule does not apply when
abbreviations or acronyms include numbers of any kind - Roman,
Arabic, or ordinal. Examples:
III MEF 24th MEU 1st MarDiv USMC
BLT 2/3 2d MAW COA HQMC
7th Mar FMFPac I-IStf MARFORRES
(b) As an exception to the above, when using
abbreviations in naval correspondence and directives use a comma
and a space between the different levels of command. Example:
Co, 1st Bn, 5th Mar, 1st MarDiv, FMF.
(c) When allotted space is restrictive for making an
entry in the service record or when preparing certain NAVMC or
other forms, the spacing between the numerical designation of the
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