Historical clue formulations

• Some military defenses, for short — 2015-10-07
• 1972 treaty subjects, briefly — 2013-03-16
• Means of defense: Abbr. — 2008-03-02
• Some mil. defenses — 2008-01-30
• Contents of some silos: Abbr. — 2006-05-26
• Defense means, briefly — 2006-02-09
• Some military defenses: Abbr. — 1996-05-20
• Mil. defense systems — 1995-02-27
• Airborne defenses, for short — 1994-12-28