Highest to lowest: Marine Expeditionary Force (MEF), Division (3 regiments), Regiment (3 battalions), Battalion (3 rifle companies, 1 weapons company, 1 headquarters and support company), Company (3 rifle platoons, 1 weapons platoon, 1 H&S platoon), Platoon (3 squads), Squad (3 fire teams), Fire team (team leader, SAW gunner, grenadier, and a rifleman).
The Marine Corps hierarchy starts with the Marine Corps as a whole, led by the Commandant of the Marine Corps. Below that, there are divisions, which are made up of several regiments. Each regiment consists of multiple battalions, which are further divided into companies, platoons, and squads. The hierarchy continues down to fireteams, which are the smallest operational unit in the Marine Corps.
Highest to lowest: Marine Expeditionary Force (MEF), Division (3 regiments), Regiment (3 battalions), Battalion (3 rifle companies, 1 weapons company, 1 headquarters and support company), Company (3 rifle platoons, 1 weapons platoon, 1 H&S platoon), Platoon (3 squads), Squad (3 fire teams), Fire team (team leader, SAW gunner, grenadier, and a rifleman).
Team: Four individual Marines assigned to a specific team (Three team members, plus the team leader).Squad: Three Teams are assigned to a specific squad.Platoon: Three squads are usually assigned to a specific platoon.Company (or Battery): Three platoons are assigned to a Company (sometimes called a battery). The Company/battery is the lowest level of command with a headquarters element (example, a Company Commander, or Company First Sergeant).Battalion: Three companies/batteries are assigned to form a battery a battalion.Regiment: Three battalions form a Regiment (Sometimes called a Brigade).Division: Three Brigades are assigned to make up a Division.Marine Corps: Three or more divisions and Aviation Wings plus such additonal forces as may be required make up the Marine Corps.
There are 4 brigades in a division. Each brigade has 6 battalions in it (2 infantry battalions, 1 artillery battalion, 1 BSB, 1 BSTB, and 1 Cavalry battalion) so to answer your question in a standard division there are 24 battalions
1st Battalion, 9th Marine Regiment
The 2nd Battalion, 9th Marines.
180
Sizes vary with the structure and the structure varies depending on budget and the needs of the country. It could be up 10 regiments in a Division. The normal Table of Organization calls for three Infantry Regiments and one of them will be an artillery Regiment.
Presidential Unit Citation (United States). The 9th Marine Regiment. The 26th Marine Regiment. The 1st Marine Regiment. Plus second award. The 5th Marine Regiment. The 1st Marine Division. Plus second award. The 3rd Marine Division. The 1st Marine Aircraft Wing. MAF. MACV.
I don't believe any 3 division units were part of the D-day invasion forces.The 3rd US Infantry Division did not land in Normandy. They were in Italy until July 1944 and then were part of Operation Dragoon that landed in Southern France to support the breakout of Normandy.The 3rd British Division did land on SWORD beach. The British division was sub-divided into Brigades. The 3rd Division included the following units:From Wikipedia:British forces - 3 Division Group3rd Division - Major-General TG Rennie8th Brigade (Assault Brigade) 1st Battalion Suffolk Regiment2nd Battalion East Yorkshire Regiment1st Battalion South Lancashire Regiment9th Brigade 2nd Battalion Lincolnshire Regiment1st Battalion King's Own Scottish Borderers2nd Battalion Royal Ulster Rifles185th Brigade 2nd Battalion Royal Warwickshire Regiment1st Battalion Royal Norfolk Regiment2nd Battalion King's Own Shropshire Light InfantryDivisional Troops 3rd Reconnaissance Regiment RAC33rd and 76th Field Regiments RA (self-propelled guns)7th Field Regiment RA20th Anti-Tank Regiment RA92nd (Loyals) Light Anti-Aircraft Regiment, Royal Artillery3rd Divisional Engineers3rd Divisional Signals2nd Battalion Middlesex Regiment (machine guns)5th Royal Marine Armoured Support Regiment27th Armoured Brigade(DD Tanks) 13th/18th Royal Hussars1st East Riding YeomanryStaffordshire Yeomanry1st Special Service Brigade - Brigadier Lord Lovat No. 3 Commando - Lt-Col Peter YoungNo. 4 Commando - Lt-Col Robert Dawson A force of 176 French Marine Commandos from No. 10 (Inter-Allied) Commando landed with No. 4 CommandoNo. 6 Commando - Lt-Col Derek Mills-RobertsNo. 45 (Royal Marine) Commando - Lt-Col Charles Ries4th Special Service Brigade - landed between Juno and Sword
There is a battalion for women Marine recruits on Parris Island.There is a battalion for women Marine recruits on Parris Island.There is a battalion for women Marine recruits on Parris Island.There is a battalion for women Marine recruits on Parris Island.There is a battalion for women Marine recruits on Parris Island.There is a battalion for women Marine recruits on Parris Island.
The 5th and 6th Marine Regiments and the 6th Machine Gun Battalion became the 4th Marine Brigade with a troop strength of 9,444 men. They were combined with the 2nd Engineer Regiment (US Army) and 3rd Brigade, US Army to form the 2nd Division (Army), American Expeditionary Force. The Second Division was under the command of two different Marine Corps Generals at different times during WWI, Brigadier General Charles A. Doyen and Major General John A. Lejeune.
The battle of Okinawa.