Yes, and I was confused when I first encountered jcustis' posts on the Battle Captain - I was unaware the US had them in the Commonwealth sense, and I wondered if things had recently changed as a result of battle experience in Iraq and A-Stan. I now see that the US Army Battle Captain or USMC Watch Officer is the same as the Watch/Duty Officer at Bn/Rgt/Bge HQ in Commonwealth Armies.
I had known of, as you point out, the roles of both the Company CO and XO in the US system, and I was quite lost when I saw this thread about the "Battle Captain", and I assumed that some new innovation had been made in the USMC somewhat along Commonwealth lines, presumably as a result of recent battle experience. I had no idea that the US Army had "Battle Captains" (but I now know what the usage of that term in the US Army is).
In the Commonwealth system, there are 3 officers at Company/Squadron level:
The OC (Officer Commanding - 1i/c if you will - a Major) commands the infantry company or tank squadron in battle ("F" Echelon) and listens in, but only responds when very necessary to, the Bn/Reg radio net, while actively using the Coy/Sqn radio net himself to control the fight.
The 2i/c (a Captain, but sometimes a Major himself as well) takes care of the Coy/Sqn HQ and Admin (Coy/Sqn Logistics in general: the Company/Squadron Sergeant Major commands "A1" Echelon, not the 2i/c - my error - front-line resupply, casevac, and HQ defence, while Company/Squadron Quarter-Master Sergeant commands "B" Echelon - CQ/SQ - stores, etc.). I think the 2i/c listens in to both the Coy/Sqn radio net and the Bn/Rgt net. The 2i/c (or CSM/SSM) may lead an armed resupply body to, and casevac back from, the front line ("F" Echelon).
The Battle Captain (3i/c, if you will - an experienced Captain) accompanies the OC to the front line ("F" Echelon) and joins him in the battle. Think of the Battle Captain as a sort of Company S-3, maybe that's the easiest, but not the exact, way to describe his function. The Battle Captain is on the horn to both Battalion/Regiment HQ (sitreps) and decides which messages are for the OC's ear, and to Coy/Sqn HQ and sends orders for ammo/fuel resupply and casevac to the 2i/c. The Battle Captain deals with the Bn/Rgt S-3 and other requests for info, leaving the OC to concentrate on the fight. If the OC is killed, the Battle Captain assumes command of the Coy/Sqn until the 2i/c arrives from Coy/Sqn HQ. The Company/Squadron Sergeant-Major CSM/SSM takes command of Coy/Sqn HQ in that event.
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