Here's another interesting tidbit: On 12/7/41 there were over 22,000 US Army troops in Alaska mostly at Forts Mears and Richardson. Dutch Harbor was an operating US Naval base primarily intended for submarines. Kodiak and Sitka Islands in the Aleutian chain both had operating air bases on them along with the one at Dutch Harbor. Oh, in the canal zone both entrances were heavily mined even prior to the war with bottom placed command detonated mines (there were operating stations on the shore in sight of where the mines were placed and these were connected by a cable to the mine). There were occasional problems with ships snagging the cables but, these were in place. Interestingly, these mines were Army operated by the Army mine planter service who also manned the ships that maintained them.