GOOGLE THIS: “Not even the President of the United States can request a Marine to carry an umbrella without the express consent of the Commandant of the Marine Corps, according (to) the Marine Corps Manual.
Apparently the CinC knows NOTHING about military protocol The military is NOT his 'wait staff'.
From the Marine Corps Uniform Board:
3035. UMBRELLAS. Female Marines may carry an all-black, plain standard or collapsible umbrella at their option during inclement weather with the service and dress uniforms. It will be carried in the left hand so that the hand salute can be properly rendered. Umbrellas may not be used/carried in formation nor will they be carried with the utility uniform.