Between July and December 1941, the garrison received 8,500 reinforcements. After years of parsimony, much equipment was shipped. By November, a backlog of 1,100,000 shipping tons of equipment intended for the Philippines had accumulated in U.S. ports and depots awaiting vessels. In addition, the Navy intercept station in the islands, known as Station CAST, had an ultra secret Purple cipher machine, which decrypted Japanese diplomatic messages, and partial codebooks for the latest JN-25 naval code. Station CAST sent MacArthur its entire output, via Sutherland, the only officer on his staff authorized to see it.