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//0xc bytes (sizeof)
struct _SECURITY_QUALITY_OF_SERVICE
{
    ULONG Length;                                                           //0x0
    enum _SECURITY_IMPERSONATION_LEVEL ImpersonationLevel;                  //0x4
    UCHAR ContextTrackingMode;                                              //0x8
    UCHAR EffectiveOnly;                                                    //0x9
};