I can see where soldiers policing might add another layer of corruption.
The National Guard should be placed in a guard and assist only capacity working under the Police Departments jurisdiction IMO.
On a side note: Racial distribution of Washington population: 39.07% are white, 43.26% are Black or African American, 0.30% are American Indian and Alaska Native, 4.09% are Asian, 0.06% are Native Hawaiian.