Dear, dear, these talkies! Take "The Leatherneck." Corking drama. But what do they do to it? Why, make it talkie. The story is about loyalty and sacrifice in the marine corps in China. Strong stuff, and virile. William Boyd, Alan Hale and Bob Armstrong are grand. But when beautiful Diane Ellis speaks, bang goes a lovely illusion. Despite vocal distractions, however, the picture's there. Don't miss it.