The candies quickly became useful to American soldiers during World War II because they were convenient to carry and easier to handle in warm weather. Their popularity continued after the war, and the company gradually introduced new colors, peanut varieties, and other flavors. What began as a practical military snack became a favorite among families.
However, the original partnership eventually came to an end. Bruce Murrie left the business, and Forrest Mars gained control. Despite that change, the two letters remained, preserving the history of the men who helped create the famous candy.