anyone know these survivors

hey i am the grandaughhter of Albert Nash and he was in the air force during WWII he flew a B-17 out of Africa..he was in the 2nd bomb group in the 429th squadron...he was shot down on august 4 1943 over naples and he was taken prisoner by the germans...there were 2 more men that survived the crash...pilot: captain william h mayer and bombadier Lt. Elmo F McClain...my gramp hasnt seen these men in years...if anyone knows them or if they are still alive help me find them!! thanks!