SERGT. MANUEL SERRANO, 24, ispictured above as he appeared on rejoining his paratroop outfit in Italy after 20 months’' absence. The Puerto Rico-bom GI who has lived in Brooklyn since he 'was five years old, was captured by Nazis in Tunisia in November, 1942, and escaped from prison camp in Italy in September, 1943. He then Joined an Italian patriot camp in the mountains near Sar-hano, fighting with the patriots until he found his way back to his outfit in July •(International)let