San Diego (named after Saint Didacus) is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round climate, its natural deep-water harbor, and its long association with the U.S. Navy.
San Diego had been the home of the US Pacific Fleet until it moved to Hawaii. After the islands surrendered to the Japanese in early 1942, the US Pacific Fleet re-based there. During both attempts to retake the islands, San Diego was the nerve center for US Naval activity.
Sandago was a nation with which the Valley had some contact. Unlike in the Home timeline, where the drive from Los Angeles to San Diego would only take a couple of hours by car, the trip between the Valley and Sandago in the alternate was about a week by horse-drawn carriage.