The US Army Mess Kit was a standard issue item for soldiers during WW2, Korea, and the Vietnam War. The kit consisted of a set of metal dishes and utensils that could be used for eating and cooking food while in the field.
The Regal brand was one of several manufacturers that produced mess kits for the US military during this time period. The kits were typically stamped with a date and other identifying marks to ensure that they were properly accounted for and maintained.