Lyndon Johnson actually said...

But clearly the fighting in South Vietnam is not yet at an end.

The Secretary of Defense is authorized to delegate to one or more of the Secretaries of the military Departments any of the authority confer...

The Secretary of Defense is hereby authorized and directed to call into the active military service of the United States, as he may deem app...

I do command all persons engaged in such acts of violence to cease and desist therefrom and to disperse and retire peaceably forthwith.