See the KC-X tanker program as an example:
01/2007 - RFP comes out
02/2008 - Northrop Grumman wins
03/2008 - Boeing successfully protests
08/2008 - Revised RFP comes out, then cancelled
09/2009 - Third RFP comes out
02/2011 - Boeing wins
https://en.wikipedia.org/wiki/KC-X#Initial_competition
See the KC-X tanker program as an example:
01/2007 - RFP comes out
02/2008 - Northrop Grumman wins
03/2008 - Boeing successfully protests
08/2008 - Revised RFP comes out, then cancelled
09/2009 - Third RFP comes out
02/2011 - Boeing wins
https://en.wikipedia.org/wiki/KC-X#Initial_competition