The headquarters of the Tenth Army was formed in June 1944 at Pearl Harbor, Hawaii with the original intent of being the headquarters element for the land forces of the planned invasion of Taiwan (then known as Formosa).

Following a conference at Pearl Harbor in July between President Franklin D. Roosevelt, Admiral Chester W. Nimitz and General Douglas MacArthur, it was decided to invade the Philippines instead of Taiwan.

As a result, the Tenth Army did not have an operational assignment until the invasion of Okinawa in April 1945.

As noted earlier, one of those casualties was the commander of the Tenth Army himself, killed by an enemy shell burst while visiting a forward position.

Okinawa turned out to be the only campaign that Tenth Army would take part in during World War II.