In December 1980, he joined the
Guyana Defence Force as an
Officer cadet and travelled to the United Kingdom for military training on the Standard Military Officers’ Course Number 26, at the prestigious
Royal Military Academy Sandhurst. Phillips has also been Guyana's head of delegation to the Inter-American Defence Board from 2008 to 2009, and was Guyana's non-resident military attaché to
Venezuela. He was promoted to the rank of brigadier in 2013 by President
Donald Ramotar, before he took command of the defence force. He was appointed as the chief of the staff of the Guyana Defence Force in September 2013 and served in that position until his retirement in October 2018. Immediately following his retirement in October 2018, Brigadier Phillips was inducted into the International Hall of Fame of the CGSC,
Kansas, USA. This honour is bestowed to graduates who have achieved the highest military office in their respective country. == Political career ==