The men, Dritan Duka, 30, Shain Duka, 28, and Eljvir Duka, 25, all illegal immigrants, were each sentenced to life without the possibility of parole. The three, who operated a roofing business in Cherry Hill, N.J., were among five foreign-born Muslims convicted in December of planning an attack at the base, about 40 miles east of Philadelphia. The attack was never carried out. The other two men who were convicted, Mohamad Shnewer, a Jordanian-born taxi driver from Philadelphia, and Serdar Tatar, a convenience-store clerk from Turkey, are to be sentenced on Wednesday.