Major Tristan Harris was appointed M.B.E. (Military Division) in recognition of gallant and distinguished service in Afghanistan during the period 1st October 2008 to 31st March 2009 .
- 30 June 2010 promoted Lieutenant Colonel .
- Served in 42 and 45 Commando. Assumed command of 539 Assault Squadron Royal Marines / Armoured Support Group Royal Marines on 1 October 2012 .
- Lieutenant Colonel Tristan Harris, M.B.E., was awarded the Bronze Star Medal, bestowed by the President of the United States of America, in recognition of meritorious, gallant and distinguished services during coalition operations in Afghanistan .
 London Gazette Supp. 59182, page 15639.
 London Gazette Supp. 59499, page 14302.
 Royal Navy.Mod.UK online profiles.
 London Gazette Supp. 61529, page 6084 published 18 March 2016.
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