The full command-line option is /NAMES=case_option.

    Specifies the alphabetic casing of identifiers in source code
    statements. Valid options are:

    Option   Function

    UPPER_   Converts all identifiers to upper alphabetic case.
    CASE
    LOWER_   Converts all identifiers to lower alphabetic case.
    CASE
    AS_IS    Causes all identifiers to remain in the case used in
             source statements.

    If you use the /NAMES qualifier in a command line, you must
    supply a case_option. If you omit the qualifier from the command
    line, the default option is /NAMES=UPPER_CASE.