BRUSSELS, Belgium Sept. 30 A former pro soccer player who joined the al-Qaida terrorist network was convicted and sentenced to prison Tuesday for plotting to bomb a NATO base believed to contain nuclear weapons. Nizar Trabelsi of Tunisia, who once played professional soccer in Germany, received the maximum sentence of 10 years in prison from a court that also convicted 17 other men and acquitted five others in the largest terrorism trial in Belgium's history. Trabelsi admitted planning to drive a car bomb into the canteen of the Kleine Brogel air base, a Belgian military post used by NATO where...