Historical clue formulations

• Sarge's charges: Abbr. — 2013-10-20
• Ones under sgts., in the Army — 2013-06-17
• E-1s and E-2s, in the Army: Abbr. — 2013-02-02
• A lot of mil. personnel — 2010-05-23
• Most G.I.'s: Abbr. — 2006-04-11
• U.S.M.C. recruits: Abbr. — 2002-01-11