Falkland Islands barracks ship
On 2 April 1982 Argentina invaded the Falkland Islands, and between 7 April and 12 May elements of a UK Task Force left Britain for a counter-invasion of the islands. Rangatira underwent sea trials for the UK Ministry of Defence, which on 15 May 1982 chartered her for possible service as a hospital ship.[1][2] This was later changed to service as a barracks ship.[1][2]
Rangatira went to HM Naval Base Devonport,[1] England where she was modified for war service. This included fitting underway replenishment equipment for bunkering at sea, adding a helicopter deck to her A-deck strong enough for a Boeing CH-47 Chinook, and arming with four Oerlikon 20 mm cannon on her upper decks.[1] Her accommodation was increased to about 1,200 people, with each two-berth cabin being increased to six berths.[1] Her upper car deck was again remodelled, this time with three mess decks, a sergeants' mess and a lecture theatre.[1] Her lower car deck was equipped with 14 freezer containers, holding enough food to feed 1,200 people for six months.[1]
P&O arranged Rangatira's crew,[1] appointing Blue Star Management to manage her.[2] Her senior officers were drawn from the Union Company and the remainder were from Blue Star Line.[1] A Naval Party was also embarked under the nomenclature NP2070, consisting of Radio Operators, airmen, gunners and engineers. She sailed from Southampton, England on 19 June and reached Port Stanley in the Falklands on 11 July,[1][2][3] where she spent the next 14 months as a barracks.
On 26 September 1983[2][3] Rangatira left Port Stanley and on 18 October she arrived back at HMNB Devonport, where her Ministry of Defence equipment was removed.[1] She then went to Harland and Wolff in Belfast, Northern Ireland who refitted her.[1][3] On 29 March 1984[1] she left Belfast and on 30 March she arrived back in Falmouth, where she was laid up again.[2][3]