Milne first appeared and competed as part of the national team at the 2006 IAAF World Cross Country Championships in Fukuoka, Japan, where he placed twenty-eighth in the men's senior eight kilometre run.

[6] At the 2008 Summer Olympics, Milne ran in the first heat of men's 1500 metres, against ten other athletes, including Leonel Manzano of the United States, and New Zealand's Nick Willis, who eventually won the silver medal in the final.

Milne, unlike his two other teammates, failed to advance into the semi-finals, as he ranked below five mandatory qualifying slots for the next round.

[9] Milne currently resides in Guelph, Ontario, and trains for the Speed River Track Club under his head coach Dave Scott-Thomas, who also worked for numerous top-level Canadian athletes.

[4] He has a degree in business administration from the High Point University in the United States, and worked as a field researcher for a company in Ontario which develops geospatial technology.