I was looking through the old U.S Battleship line, and I noticed this oddity with the Colorado-class battleships. There were 4 ships planned for the class, which were Colorado, Maryland, Washington and West Virginia. Maryland was the first commissioned into service, while the other 3 were still in construction, all launched as of 1922. Due to the WNT, however, Washington was sacrificed as a target while the others continued into service. Why was the original Washington sacrificed, but not her younger sister West Virginia?
To be frankly honest, I could not find any information on why Wash was sacrificed, but Weevee was spared. The only source I had was the Washington Naval Treaty stating that all capital ships that were still under construction as of February 6th, 1922 were to have their construction halted indefinitely to comply with treaty regulations. Colorado, Washington and West Virginia were under this category, but the former and latter were spared.
Usually, according to ship construction methods, if the class gets reduced, the youngest ships get chopped off first, which mean that West Virginia was the most likely ship to be scrapped first due to the Washington Naval Treaty. This is because of construction time of ships, since Washington was launched earlier than West Virginia and was 75.9% complete by the time the Washington Naval Treaty came around. This means that less time is required for the ship to be constructed and be commissioned into service, and less time trying to rearrange what ships needed what. Also, since the Colorado's were under the individual 35,000 ton limit for each ship, that was not a good reason to scrap Wash either.
So, if they had decided to scrap Weevee instead of Wash, it would have gone like this (based on OTL averages):
USS Colorado (BB-45) would be commissioned on August 30th, 1923. Like OTL.
USS Maryland (BB-46) would be commissioned on July 21st, 1921. Like OTL.
USS Washington (BB-47) would have been commissioned somewhere around June to November of 1923, in this ATL.
USS West Virginia (BB-48) would have been scrapped/used as a target in this ATL.
So, why did the USN decide to use Wash as a target rather then West Virginia?