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The United States Marine Corps consists of 198,590 personnel (including 8,000 women). It is controlled by the Department of the Navy. It provides operating forces for the Fleet Marine Force (FMF), complements aboard naval vessels, security forces at embassies and naval shore establishments and other assigned forces. The USMC has always been distinguished by its aggressive fighting qualities and its esprit de corps.

In general, its officers are dedicated, the NCOs hard, long-service types, and the enlisted personnel highly motivated through vigorous training and indoctrination in the “Marine Way”. For these reasons, the Marines tend to attract men seeking the spartan, military life.

The Fleet Marine Force is integral to the US Fleets and are subject to the operational control of the respective fleet commanders. The Commandant of the Marine Corps retains administrative control as well as control for individual and intra-unit training. An FMF’s air and ground elements are combined into a variety of mission oriented Marine Air-Ground Task Forces (MAGTFs). These task forces are designed for use in amphibious assault and are the principal means of projecting naval power ashore.

An FMF consists of a headquarters, a force service group (FSSG), one or more Marine Divisions, one or more Marine Air Wings and sometimes one or more Marine Amphibious Brigades.

Fleet Marine Force, Atlantic is headquartered at Norfolk, VA.
II Marine Amphibious Force: Camp Lejeune, NC
4th Marine Amphibious Brigade (Norway contingency)
6th Marine Amphibious Brigade (Landing Force, 6th Fleet)
Force Troops
HQ & Service Bn
2nd Force Recon Co
2nd Air/Naval Gunfire Liaison Co
2nd Force Service Support Group
2nd Marine Division: Camp Lejeune, NC
HQ & Service Bn
2nd Recon Bn
2nd Combat Engineer Bn
2nd Tank Bn
2nd Assault Amphibian Bn
2nd Light Armored Vehicle Bn
2nd Marines
1-2 MAR, 2-2 MAR, 3-2 MAR
6th Marines
1-6 MAR, 2-6 MAR, 3-6 MAR
8th Marines
1-8 MAR, 1-8 MAR, 3-8 MAR
10th Marines
1-10 MAR (155T), 2-10 MAR (155T), 3-10 MAR (155T),
4-10 MAR (155T GS), 5-10 MAR (155SP/203SP)
2nd Marine Aircraft Wing: Cherry Point, NC
Marine Air Control Group 28: Cherry Point NC
3rd Light Anti-aircraft Missile Battalion (Stinger)
2nd Forward Area Air Defense Battery (IHAWK)
MAG-14: Cherry Point NC
VMAQ-2, VMA(AW)-332, VMA(AW)-533, VMAO-1,
VMGR-252,VMGRT-253
MAG-26: New River, NC
HMM-261, HMM-264, HMM-266, HMM-362, HML/A-167,
HMT-204
MAG-29: New River, NC
HMM-162, HMM-263, HMM-365, HMH-464, HML/A-269,
VMO-1
MAG-31: Beaufort, SC
VMFA-115, VMFA-122, VMFA-251, VMFA-312, VMFA-333,
VMFA-451
MAG-32: Cherry Point, NC
VMAT-203, VMA-223, VMA-231, VMA-331, VMA-542

Fleet Marine Force, Pacific is headquartered at Camp H.M. Smith, HI.
I Marine Amphibious Force: Camp Pendleton, CA
5th Marine Amphibious Brigade: Camp Pendleton, CA
7th Marine Amphibious Brigade: Twenty Nine Palms, CA (CENTCOM)
1-4 MAR, 1st Light Armored Vehicle Bn, 3rd Tank Bn, Co D-3rd Assault Amphibian Bn, 5-11 MAR (155SP/203SP)
Brigade Service Support Group 7
Marine Aircraft Group 70 (El Toro, CA)
(equipment prepositioned at Diego Garcia. In war time would be augmented by 2 infantry battalions, one assault amphibian bn, one reconnaissance co, one engineer co and several forward air-defense teams).
Force Troops
HQ & Service Battalion
1st Force Recon Co
1st Air/Naval Gunfire Liaison Co
1st Force Service Support Group

1st Marine Division: Camp Pendleton, CA
HQ & Service Bn
1st Recon Bn
1st Combat Engineer Bn
1st Tank Bn
3rd Assault Amphibian Bn
1st Marines
1-1 MAR, 2-1 MAR, 3-1 MAR
5th Marines
1-5 MAR, 2-5 MAR, 3-5 MAR
7th Marines
1-7 MAR, 2-7 MAR, 3-7 MAR
11th Marines
1-11 MAR (155T), 2-11 MAR (155T), 3-11 MAR (155T),
4-11 MAR (155T GS)
3rd Marine Aircraft Wing: El Toro, CA
Marine Air Control Group 38: El Toro, CA
2nd Light Anti-aircraft Missile Bn (Stinger)
3rd Forward Area Air Defense Bty (IHAWK)
MAG-11: El Toro, CA
VMFP-3, VMFA-313, VMFA-531
MAG-13: El Toro, CA
VMA(AW)-121, VMA-211, VMA-214, VMA(AW)-242,
VMA-513, VMGR-352
MAG-16: Tustin, CA
HMM-164, HMM-166, HMM-268, HMH-361, HMH-363,
HMH-462, HMH-465, HMH-466, HMT-301
MAG-39: Camp Pendleton, CA
VMO-2, HML/A-169, HML/A-367, HML/A-369, HML/A-267,
HMT-303
Combat Crew Readiness Training Group 10: El Toro, CA
VMFAT-101

III Marine Amphibious Force: Okinawa
1st Marine Amphibious Brigade: Hawaii
3rd Marines
1-3 MAR, 2-3 MAR, 3-3 MAR
1-12 MAR (DS 155T), Brigade Service Support Group 1, one company of 3rd Recon Bn, 2 aslt amphib plts 1st Track Vehicle Bn

9th Marine Amphibious Brigade: Okinawa
Force Service Troops
HQ & Service Bn
3rd Force Recon Co
3rd Force Service Support Group

3rd Marine Division: Okinawa
HQ & Service Bn
3rd Recon Bn (-)
3rd Combat Engineer Bn
1st Track Vehicle Bn (2 tank, 2 aslt amphib cos)
4th Marines
1-4 MAR, 2-4 MAR, 3-4 MAR
9th Marines
1-9 MAR, 2-9 MAR, 3-9 MAR
12th Marines
2-12 MAR (155T), 3-12 MAR (155T), 4-12 MAR (155T GS),
5-12 MAR (155SP/203SP)

1st Marine Aircraft Wing: Okinawa
Marine Air Control Group 18: Futenma, Okinawa
1st Forward Area Air Defense Bty (IHAWK)
MAG-12: Iwakuni, Japan
VMA(AW)-224, VMA-311, VMAQ-2 Detachment
MAG-15: Iwakuni, Japan
VMFA-232, VMFA-233, VMFP-3 Detachment
MAG-36: Futenma, Okinawa
HMM-262 , HML/A-267, HMH-462, VMO Detachment,
VMGR-152

US Marine Corps Reserve
4th Marine Division: New Orleans, LA
HQ & Service Bn
4th Recon Bn
4th Tank Bn
8th Tank Bn
4th Assault Amphibian Bn
4th Air/Naval Gunfire Liaison Co
4th Force Recon Co
23rd Marines
1-23 MAR, 2-23 MAR, 3-23 MAR
24th Marines
1-24 MAR, 2-24 MAR, 3-24 MAR
25th Marines
1-25 MAR, 2-25 MAR, 3-25 MAR
14th Marines
1-14 MAR (105T), 2-14 MAR (105T), 3-14 MAR (105T),
4-14 MAR (155SP), 5-14 MAR (203SP)

4th Marine Air Wing: New Orleans, LA
4th Light Anti-aircraft Missile Bn (Stinger): Fresno CA
MAG 41: Dallas, TX
VMFA-321 (F-4S), VMFA-12 (F-4S)
MAG-42: Alameda, CA
VMA-124 (A-4M), VMA-131 (A-4M), VMA-133 (A-4M),
VMA-134 (A-4M), VMA-142 (A-4M), VMA-322 (A-4M)
MAG-46: El Toro, CA
HMM-764 (CH-46), HMM-774 (CH-46), HML-767 (UH-1),
HMA-770 (AH-1), HMA-773 (AH-1)
MAG-49: Willow Grove, PA
HMH-722 (CH-53), HML-776 (UH-1)
4th Service Support Group

Source is the 13th, 14th and 15th Editions of The Ships and Aircraft of the US Fleet”, “Armies of NATO’s Central Front”

The USMC 5th and 6th Marine Divisions from the American Vehicle Guide are the last two Marine divisions organized for World War II.

The 5th Marine Division was activated on 21 Jan 1944 and took part in the Iwo Jima campaign, after which it was withdrawn back to the US and deactivated 5 February 1946. It was reactivated in March 1966 to replace the 1st Marine Division when that unit deployed to Vietnam. Its 26th and 27th Marine regiments served in Vietnam. It was deactivated in 1970.

Its combat regiments consisted of the 26, 27th and 28th Marines (infantry) and the 13th Marines (artillery)

The 6th Marine Division was activated 7 September 1944 (at Tassafaronga, Guadalcanal) and it took part in the Okinawa campaign. It served as occupation forces in Japan and China and was deactivated on 31 March 1946 (Tsingto, China), it is one of a handful of US divisions that were formed overseas. It has never been reactivated.

Its combat regiments consisted of the 4th, 22nd, and 29th Marines (infantry) and the 15th Marines (artillery).

Source is “US Marine Corps World War II Order of Battle”