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Kathy, you are correctKathy, you are correct about hoisting the flag on Memorial Day, however, it is not termed 'half mast', but 'half staff' as a mast is on a ship. A Staff is a land based flagpole.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?