New York - Those smiley door greeters are back at Wal-Mart.

The nation’s largest retailer said in a blog post this week that it’s bringing back door greeters to a majority of its 5,000 stores by mid-summer to improve customer service. For stores which have been selected as higher risks for thefts, Wal-Mart will position a “customer host,” who will not only greet customers but also check receipts to prevent theft. That was flagged as a growing problem last year. Those workers will be trained to help deter potential shoplifters.

The rollout follows a successful pilot program.

Four years ago, the discounter decided to remove the workers at the front of the store and relocated them to other areas.... Read More: VIN