Just done a quick read up about the friendly fire incident at the falklands.
For anyone who is interested:
Blue On Blue
On the night of June 2nd a 'friendly fire' incident took place between the SAS and the Special Boat Squadron (SBS). An SBS patrol had apparently strayed into the SAS patrol's designated area and were mistaken for Argentine forces. A brief firefight was initiated during which one of the SBS patrol, Sergeant Ian Hunt, was gunned down. This tragic incident was the catalyst for improved cooperation between the rival units.
http://www.eliteukforces.info/special-air-service/history/falklands/
Another SBS member was also injured in the fracas. The SAS ambushed the SBS patrol by mistake.
It happens, and poor communication is alwys a risk, especially back then. Blue on Blue is just the term for 'friendly fire'

