A tactical recognition flash (TRF) is a coloured patch worn on the arm of combat clothing by members of the Royal Navy,British Army and Royal Air Force as well as a number of other Commonwealth militaries to distinguish their regiment or corps in the absence of a cap badge. It is similar to but distinct from the DZ Flashes worn by members of Airborne Forces. The colours of the TRF are sometimes derived from the unit's stable belt.
The Light Dragoons Flash shown here is often called the Balaklva Flash, it is a distinction that was awarded by the Colonel-in-Chief Baden Powell.
TRFs should not be confused with formation signs or insignia, which are used to denote the formation (usually brigade or division or a higher headquarters) and are worn in addition to TRFs by a member of any regiment or corps serving in that formation.
In 2007, the Royal Navy introduced a TRF, the RN corporate logo. This short lived idea was abolished in late 2008 by a decision of the Naval Service Clothing Committee, along with the large "Royal Navy" breast patch, and replaced by a curved shoulder patch with the same wording.