Historical clue formulations

• Home of the Rockies: Abbr. — 2012-06-19
• Home of Steamboat Spgs. — 2011-07-15
• Boulder's home: Abbr. — 2010-01-25
• U.S.A.F. Academy site — 2008-07-06
• Neighbor of N.M. — 2002-10-13
• Denver's home: Abbr. — 1997-01-06