Post
by SGM (ret) » Sun Jan 23, 2022 7:42 am
I actually misunderstood Ron's point in his post when I replied. (Sorry, Ron.)
He is correct with regards to WWII armored regimental organization. The line companies were letterd sequentially through all three battalions starting with A ("Able") company, 1st battalion and ending with I ("Item") company, 3rd battalion. So, in WWII there was no B ("Baker") company in the 2nd battalion. B ("Baker") company was in 1st battalion. The three 2nd battalion companies would have been D, E, and F ("Dog," "Easy," and "Fox").
The change to lettering each battalion's companies A, B and C took place sometime in the late 1950's to around 1960. I'm not sure exactly when, but probably took place when the change from the Pentomic Division organization was made back to the triangular division organization. I'm pretty sure the Army continued to letter all the companies sequentially during the Korean War, but by the 1960's, they were using the A-B-C-BN system. So, between the Korean War and the end of the Pentomic Division era (~1957-~1960 during ROCID and ROTAD) was probably when the change to lettering companies occurred.
The Pentomic Division experiment is pretty fascinating study if you're into the nuts and bolts of how the US Army works and what makes it tick. This is the period when regimental cohesion and identity was pretty much destroyed and the origin of all the (failed) efforts ever since to find or recreate that source of esprit d'corps. A century-plus of regimental identity and moral destroyed in a blink of an eye. Once that chain was broken, it's never been reforged.
Finally, in general terms, it's important to keep in mind that battalion organization is also different at different historical periods and within different types of divisions, brigades and regiments. For example, in the history of the same infantry battalion over the course of time, you could find references to "Able," "Baker," "Charlie," and "Dog" companies, and later on you might find "Alpha," "Bravo," "Charlie" and "Delta" companies and then later still the references might be to "Alpha," "Bravo," Charlie" and "CSC" ("Combat Support Company" aka "Weapons Company") companies.