Back Our BovsHere ThursdayMr. and Mrs. Charles Wayt,318 N. 10th St., who lost a son in Vietnam, are sponsoring a “Back Our Boys in Vietnam” rally at the Kopper Kettle Thursday at 7:30 p.m.Explaining their rally purpose, the Wayts said “we lost one son in the war and we don’t want to think he died in vain. We wantto motivate the people in Cambridge about Vietnam.”Their son, Charles Melvin Wayt, was killed in Vietnam in 1967 when he was 19.A petition will be presented at the rally, backing the war, ami it will be sent to area congressmen.The meeting, in the upstairs room of the restaurant, is open i to the public and coffee will be served.