In addition to a focus on its broad retail operation, Walmart keeps tabs on threats with its Global Security Operations ...

With these distribution centers, Walmart seeks to stay ahead of changes in technology at the 4,600 Walmart stores, according to a news release. It is now the largest grocery retailer in the U.S.

According to a report by Bloomberg, cited sources familiar with the matter, Walmart has already opened one of these "dark stores" in Dallas, Texas, with plans for further distribution centers in ...