Wal-Mart Says Tech Investments, Such as Warehouse Drones, Will Boost Online Sales Posted by June 6, 2016 Leave a comment on Wal-Mart Says Tech Investments, Such as Warehouse Drones, Will Boost Online Sales Chief Executive Officer Doug McMillon spoke about initiatives such as online grocery pick up, the retailer’s two-day shipping program and its mobile wallet, Wal-Mart Pay.