 In another incident, on 28 January 1964, a MiG-19 shot down a T-39 Sabreliner which had strayed into East German airspace while on a training mission; all three crewmembers were killed.Hanoi decided in early 1969 to strengthen its air defenses by creating a third jet fighter unit; the 925th Fighter Regiment.This unit would consist of late model MiG-17s and the newly acquired MiG-19s (nearly all of which were Shenyang J-6s from the People's Republic of China (PRC)).