Historical clue formulations

• SALT subject, for short — 2019-05-05
• Defensive weapon, for short — 2011-03-28
• Rocket interceptor, for short — 2011-02-01
• 1972 treaty subj. — 2010-03-04
• 1972 treaty subj. — 2009-01-13
• 1972 treaty subj. — 2006-09-03
• 1972 treaty subj. — 2006-02-22
• Patriot, e.g.: Abbr. — 2006-01-06
• S.D.I. weapon — 2003-04-30
• 1972 treaty subj. — 2001-12-09
• Defense syst. — 1996-12-10
• S.D.I. component — 1994-11-18