 28 Squadron (Support Helicopter OCU), all of which are based at RAF Benson.The first two Puma HC1s ("XW198" and "XW199"), of an eventual 48, were delivered in January 1971, which were supplemented by a captured Argentine Army SA 330J in 2001 and six ex-South African Air Force SA 330Ls in 2002.24 of the Puma HC1s underwent upgrades to HC Mk.2 standard between 2012 and 2014.