In September 1960, the "Luftwaffe" received their first two Fiat-built G.91 R/3 aircraft. An initial five G.91R/3 aircraft were delivered to "Erprobungstelle 61" for trials with subsequent deliveries being allocated to "Aufklärungsgeschwader 53" (53rd Reconnaissance Group) based at Erding, near Munich along with "Waffenschule 50" (Weapons School 50). On 20 July 1961, the first Dornier-built G.91 performed its first flight. The G.91R/3 equipped four newly formed "Leichte Kampfgeschwader" (light attack wings), often being used to replace older aircraft such as the American-built Republic F-84F Thunderstreak.