Historical clue formulations

• Draft status — 2024-04-11
• Signed up — 2023-02-13
• Joined the Army, say — 2019-05-01
• In force? — 2016-11-26
• Up in arms? — 2013-08-28
• Like privates — 2011-04-22
• Volunteered — 2006-04-01
• Volunteered — 2005-01-01
• Joined the ranks — 2002-06-06