The new sales pitch for S.D.I. runs smack up against the recommendations of Mr. Reagan's own Commission on Strategic Forces, the panel that so effectively closed the window of vulnerability back in 1983. 1987 August 31, Howard Ris, “Don't Buy the S.D.I. Soap”, in The New York Times, →ISSN, archived from the original on 12 Apr 2022:
(abbreviation, alt-of, initialism) Initialism of Steel Deck Institute.