Flash is refereing to this incident:-
During the 2003 invasion of Iraq, two Royal Navy Westland Sea King ASaC7 AEW helicopters, XV650, 'CU-182', and XV704, 'R-186', collide in mid-air five miles (8 km) from their aircraft carrier HMS Ark Royal while one had been leaving on a mission as the other returned from the same operation. One American exchange pilot on board, a former E-2C Hawkeye pilot formerly from Carrier Airborne Early Warning Squadron One One Five, was killed.