Historical clue formulations

• Scrubbed — 2020-04-23
• Scrubbed — 2020-03-12
• Scrubbed — 2017-08-12
• Decided not to run — 2011-10-15
• Scrubbed — 2001-10-17
• Cut short — 2000-05-12
• Failed to carry out, as a mission — 1999-05-16
• Stopped at Cape Canaveral — 1996-01-24