Historical clue formulations

• Common blood type: Abbr. — 2015-05-22
• Mil. mail centers — 2015-04-22
• Blood drive spec. — 2010-10-30
• Blood type, for short — 2008-11-20
• G.I. addresses — 2008-08-24
• Where private messages may be sent?: Abbr. — 2008-04-06
• Sgts. and lts. get mail at them — 2002-11-18
• G.I. addresses — 2002-10-07
• Second-commonest blood type: Abbr. — 2002-05-17
• Mil. addresses — 2002-05-12
• Mil. addresses — 2000-04-17
• Blood type, briefly — 1999-09-19
• Mil. addresses — 1998-08-29
• G.I. addresses — 1997-01-13
• Mil. address — 1995-07-03
• Army addresses — 1994-03-04