Etymology
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D.A. 
American English initialism (acronym) for district attorney from 1934; for duck's ass haircut (or, as OED would have it, duck's arse), from 1951. The haircut so called for the shape at the back of the head.
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Tony 
masc. proper name, short for Anthony. Tony Curtis, style of men's haircut (usually with a D.A. at the back), is from 1956, from screen name of U.S. film star Bernard Schwarz (1925-2010).
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D.A.R. 

initialism for Daughters of the American Revolution, a non-profit patriotic service organization founded in 1890 for women directly descended from someone involved in the war of independence by the American colonies of Great Britain.

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