This skin represents XX411, a Westland Gazelle AH.1 which saw action in the Falklands War of 1982 with the Royal Marines. 
XX411 was hit by small arms fire and ditched during the conflict but was later restored as a memorial, it now resides at Doncaster
Aero Museum in the UK as part of their Falklands display.
The Gazelles that took part in the Falklands War have the older Black and Green Scheme as opposed to the Grey and Green Scheme 
seen on the current Army/Marines Gazelles. 

Please extract into your SA342M liveries folder