DEERFIELD, Ill.–(BUSINESS WIRE)–To express gratitude for an incredibly significant part of American history and to honor those who have served – and continue to serve – our country, Walgreens is offering an Independence Day weekend discount to all veterans, active-duty military personnel and their immediate family members. Beginning July 4 through July 7, customers with a valid military ID or proof of service will receive 20 percent off eligible regular-price products with MyWalgreens, at any