Historical clue formulations

• Extends a tour — 2020-12-13
• Avoids a service break? — 2020-04-10
• Does another stint — 2014-07-08
• Avoids a service interruption — 2012-11-10
• Opts not to be discharged — 2011-09-14
• Returns to service — 2011-04-14
• Signs on for another tour — 2009-06-25
• Stays for another hitch — 2007-03-25
• Commits to another hitch — 2004-07-23
• Signs on for another term — 2003-10-29
• Signs on again — 2003-02-13
• Enlists again — 2001-07-15
• Enlists again — 1996-05-05
• Enlists again — 1995-12-24
• Enlists again — 1994-01-02