He was appointed commandant of the Nigerian Defence Academy, Kaduna. Under the military rule of General Murtala Mohammed (July 1975 – February 1976), Lieutenant-Colonel Tarfa became Provost Marshall General and was responsible, reporting to General Theophilus Danjuma, for the clean-up campaign in the four divisions of the army. He was then given the almost impossible task of reducing traffic congestion in Lagos. He was appointed Governor of Oyo State from July 1978 to October 1979. When Ernest Shonekan came to power in November 1993, the Federal Government set up the Major-General Paul Tarfa Panel to undertake a one-year probe of the activities of the Nigeria Customs Service.