check with Greg M...MCO P1020.34F
MARINE CORPS UNIFORM REGULATIONS
CHAPTER 3: UNIFORM ITEMS AND REGULATIONS FOR THEIR WEAR
3035. UMBRELLAS (Female Marines). 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.
NOTE* Male Marines are NOT allowed to carry umbrellas under USMC Uniform regs!
He has Marines hold umbrellas, BUT did not send Marines to help in Benghazi.