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The US 1st Infantry Division and the US 29th Infantry Division (Virginia-Maryland National Guard).
The order of battle of invasion troops for OLYMPIC/MAJESTIC were 14 Divisions: 10 Army Infantry, 1 Airborne and 3 USMC equal 450,000 combat and support troops staged at Okinawa.United States U.S. Sixth Army Yakushima and Koshikijima Islands - 40th Infantry Division (22,000 men)Tanegashima - 158th Infantry Regiment (7,600 men)Miyazaki - U.S. I Corps (95,000 men): 25th Infantry Division, 33d Infantry Division, 41st Infantry DivisionAriake - U.S. XI Corps (113,000 men): 1st Cavalry Division, 43d Infantry Division, Americal Division, 112th Cavalry RegimentKushikino - U.S. V Amphib Corps (99,000 men): 2nd Marine Div., 3d Marine Division, 5th Marine Division6th Army reserves - U.S. IX Corps (79,000 men): 77th Infantry Division, 81st Infantry Division, 98th Infantry Division;11th Airborne Division (15,000 men)
26th Infantry Division was named the "Yankee Division" and their shoulder patch was a khaki Diamond with blue letters "Y D". This infantry division served in France and Germany. A typical WW2 infantry division contained about 15,000 men at full strength. It contained 3 Infantry regiments and 4 artillery battalions as well as support units such as Medial, Engineering, QuarterMaster and Signals.
For WW2: Armored Infantry Divisions were equiped with half-tracks. Regular Infantry Divisions walked (or trucked). During the Vietnam War those Armored Infantry Divisions gave way to the new MECHANIZED INFANTRY DIVISIONS, equipped with M-113 APC/ACAV (Armored Personnel Carriers/Armored Cavalry Assault Vehicles). Only one US Army Mechanized Infantry Division was in Vietnam (and only it's 1st Brigade); the 5th Mechanized Infantry Division (Red Diamond Patch). Regular Infantry Divisions in Vietnam were called "Straight Legs", "Straight" meaning...straight foot soldiering.
There were many units involved in the landing. Even an infantry division is composed of many small units such as signal corps companies etc. Infantry and armored Landing forces: 116th Regimental Combat Team(RCT) of the 29th Infantry Division 743rd Tank Battalion 16th RCT of the 1st Infantry Division 741st Tank Battalion Three companies of the 2nd Ranger Battalion were to take a fortified battery at Pointe du Hoc, followed by 5th Ranger Battalion. At H+195 minutes two further Regimental Combat Teams, the 115th RCT of the 29th Infantry Division and the 18th RCT of the 1st Infantry Division were to land, along with the 26th RCT of the 1st Infantry Division. These infantry units were supported by engineers and naval beach units.