Bartlett is the leader of the 108th Tactical Fighter Squadron Sand Island Detachment. Though he would never show it, Bartlett would give his life for his wingmen.
Bartlett -- although a very talented pilot -- has had a notoriuos history of being unable to comply with orders given, opting instead to follow his conscience. Bartlett cares for all the trainees under his command (referring to them as 'nuggets'), and secretly admires Kei Nagase's skill when she defends herself after being attacked before the start of the war.
He also seem to notice Blaze's skill, so he gave Blaze his old nickname "Kid". Thus, Blaze became his favorite pupil.
"Heartbreak One" came by his callsign after losing love interest Major Natashya in the time during the Belkan War of 1995. Years later, during the Cirsum-Pacific war (2010), she and Barlett are reunited and work together to free Prime Minister Seryozha Viktrovich Nikanor from prison. In Ace Combat Zero: The Belkan War, Bartlett appeared over Area B7R in mission 10 "Mayhem" in an aircraft with codename "HRTBRKONE".
After being shot down during the Belkan War near Area B7R by Ashley Bernitz, he met the pilot later known as Peter N. Beagle and both become great friends. His last recorded sortie was when he destroyed one of the two SOLG controls in Sudentor, Belka. It is unknown whether or not he survived.