In 1970, the fifth renewal of the original 1945 contract changed TWA's role from manager to adviser. On its 25th anniversary in 1971, the company was ready to continue without foreign assistance. Since then, Ethiopian Airlines has been managed and staffed by Ethiopian personnel. The first Ethiopian General Manager was Col. Semret Medhane, appointed in 1971. Two Boeing 720Bs were acquired from Continental Airlines in 1973. In 1975, the carrier ordered five Dash 7s. By then, Ethiopian Airlines had ended its 30-year relationship with TWA. The airline became a new customer for the Boeing 727 in 1978, ordering two. The 727s arrived in the late 1970s as a replacement for the oldest Boeing 720s.