▁emer gency ▁landing ▁platform ▁at op ▁the ▁hang ar ▁and ▁a ▁complement ▁of ▁up ▁to ▁four ▁( but ▁usually ▁one ) ▁Fle et ▁Air ▁Arm ▁West land ▁Sea ▁King ▁hel ic op ters ▁and ▁the ▁requ is ite ▁maintenance ▁facilities . ▁As ▁such , ▁they ▁are ▁often ▁used ▁for ▁av iation ▁training . ▁ ▁History ▁Two ▁ships ▁were ▁ordered ▁in ▁ 1 9 7 1 , ▁with ▁the ▁first ▁entering ▁service ▁in ▁ 1 9 7 8 . ▁Both ▁ships ▁saw ▁service ▁in ▁the ▁F alk lands ▁War , ▁the ▁then ▁Fort ▁G range ▁being ▁shadow ed ▁by ▁Argent ine ▁Air ▁Force ▁C - 1 3 0 ▁Her cules ▁aircraft ▁while ▁still ▁ ▁from ▁the ▁combat ▁area ▁and ▁Fort ▁Austin ▁being ▁attacked ▁while ▁sitting ▁in ▁San ▁Carlos ▁Water . ▁Fort ▁Austin ▁supported ▁the ▁British ▁inter vention ▁in ▁Sierra ▁Le one ▁in ▁ 2 0 0 0 . ▁ ▁Fort ▁Austin ▁was ▁moth b alled ▁in ▁ 2 0 0 9 ▁but ▁was ▁react iv ated ▁following ▁the ▁ 2 0 1 0 ▁SD SR ▁at ▁the ▁exp ense ▁of ▁. ▁Both ▁Fort ▁Ros al ie ▁and ▁Fort ▁Austin ▁have ▁had ▁major ▁ref its ▁at ▁C amm ell ▁La ird ▁to ▁enable ▁another ▁de cade ▁of ▁service . ▁In ▁ 2 0 1 1 ▁it ▁was ▁announced ▁that ▁the ▁service ▁lives ▁of ▁Fort ▁Austin ▁and ▁Fort ▁Ros al ie ▁would ▁be ▁extended ▁by ▁another ▁two ▁years ▁to ▁ 2 0 2 3 ▁and ▁ 2 0 2 4 ▁respectively . ▁They ▁will ▁ultimately ▁be