The main purpose of this legislation is to officially name a specific post office in Escondido, California, after Captain E. Royce Williams. This designation honors Captain Williams for his service and contributions, likely recognizing his achievements and legacy. The key provision of the legislation is the formal designation of the United States Postal Service facility located at 1157 West Mission Avenue as the "Captain E. Royce Williams Post Office Building." This means that all future references to this post office in any official documents or maps will use this new name.