Hampton Roads
Beginning in 1917, as the United States became involved in World War I under President Woodrow Wilson, formerly rural Sewell's Point became the site of what grew to become the largest Naval Base in the world which was established by the United States Navy and is now known as the Naval Station Norfolk.
Singapore
After the First World War, the British built the large Singapore Naval Base as part of the defensive Singapore strategy. Originally announced in 1923, the construction of the base proceeded slowly until the Japanese invasion of Manchuria in 1931. When completed in 1939, at the very large cost of $500 million, it boasted what was then the largest dry dock in the world, the third-largest floating dock, and having enough fuel tanks to support the entire British navy for six months. It was defended by heavy 15-inch naval guns stationed at Fort Siloso, Fort Canning and Labrador, as well as a Royal Air Force airfield at Tengah Air Base. Winston Churchill touted it as the "Gibraltar of the East" and military discussions often referred to the base as simply "East of Suez". Unfortunately, it was a base without a fleet. The British Home Fleet was stationed in Europe, and the British could not afford to build a second fleet to protect its interests in Asia. The plan was for the Home Fleet to sail quickly to Singapore in the event of an emergency. However, after World War II broke out in 1939, the fleet was fully occupied with defending Britain.