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The 'names' or the letters. You know 'papa' for 'p,' 'Bravo' for 'b,' though a commenter says it used to be something else. It is more masculine to say 'b as in bravo' than 'b as in boy.' Anyway the military standards to specify the letters.
Source: a psychiatrist who learned from veterans - Category: Psychiatrists and Psychologists Source Type: blogs