The 77y has been led by these colonels.
This list is as accurate as we might've been able to track it back.
77y Line of Colonels;
From about January maybe December 2010/2011 - Somewhere around spring 2011
From somwhere in the spring 2011 - Most likely start of summer 2011
From start of summer 2011 - Late July 2011
From end of July - Second week in December 2011
From second week in December 2011 - January 2013
January 2013 - August 2013
August 2013 - ?
*Following an armed coup against Aztir which resulted in 80 (virtual in game) deaths Chadman seized the Colonelship and was able to vastly increase the number of subscribers to his YouTube Channel.