Historical clue formulations

• Things seen on many state license plates — 2016-12-06
• Lines often in Latin — 2015-05-28
• Words to swear by — 2011-08-09
• "Virtute et Armis" and others — 1998-06-27
• Common inscriptions — 1996-04-25
• Guiding maxims — 1996-02-29
• "Be prepared" and "Semper fi" — 1995-12-15