antedating of SWAG

[David Barnhart]

Dickson in _War Slang_ (c. 1994) lists _SWAG_ as first coming from the
Vietnam War and identifies its meaning as "Scientific wild-assed guessing."
It does not appear in

_Dictionary of United States Army Terms_ (TM 20-205), 1944
Noel, _Naval Terms Dictionary_, 1952
Heflin, _The United States Air Force Dictionary_, 1956
_Dictionary of United States Military Terms for Joint Usage_, JCS Pub. 1,
1964
Hayward, _Jane's Dictionary of Military Terms_, 1975
Bay, _Iraq's battlefield slang_, 2007
<http://en.wiktionary.org/wiki/Appendix:Glossary_of_military_slang>

_Glossary of Military Terms & Slang from the Vietnam War_
<http://www2.iath.virginia.edu/sixties/HTML_docs/Resources/Glossary/Sixties_
Term_Gloss_Q_T.html#Letter 'S'>

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