Available American Army Units in Late 1941/Early 1942?

Supposing for a moment that things go much better for the British in North Africa with the Germans and Italians being defeated, and Libya and Tunisia occupied by the end of 1941. If they were to start eyeing Pantelleria and Sicily as the next targets for early-1942 and the US has entered the war post-Pearl Harbor attack what sort of units would be available for an American contribution that early on in the war? Thanks.
 
Formed July 1940 or earlier (18 months minimum training):
Infantry Divisions 1-8,24
Armoured Divisions 1-2
Cavalry Divisions 1
Marine Divisions 1

Plus 11 Infantry Divisions formed later in 1940
 
To Expand on Abers reply... Information is from Stauntons 'OB of the US Army in WWII'. Shown below also is info on when the divisions were "split" to provide cadres for new divisions. It was possible to provide those cadres without splitting, but significant delays would havve been incurred in training those cadres & the new formations. There were also issues in retraining the divisions when they were converted from square to triangular in 1940-41. For some the conversion/combat readiness was not complete until 1942.

............Activated...........
1 Cav..... 1921
2dCav.....1941.................Contributed cadres for 8AD 4/1942,, 9AD 4/1942, 93ID 5/1942 2d Cav inactivated 8/1942. Reactivated 3/1943
Pillipine..1921
1st.........1917.................76th ID 6/1942
2d..........1917.................85th ID 5/1942.......2d split again for...102d ID 9/1942
3rd.........1917.................81st ID 6/1942
4th.........1940.................79th ID 6/1942.......4th split again for...84th ID 10/1942
5th.........1939.......Sent to Iceland early 1942
6th.........1939.................90th ID 3/1942.......6th split again for...89th ID 7/1942
7th.........1940.................95th ID 7/1942.......7th split again for...99th ID 11/1942
8th.........1940.................85th ID 5/1942.......8th split again for...102d ID 9/1942
9th.........1940.................82d ID 3/1942.......8th split again for...88th ID 9/1942 Note 82ID redesignated Airborne 8/42
24th.......10/1941... Original Hawaiian Division
25th.......10/1941... Formed out of miscl NG units in Hawaii & other from US.
Americal..5/1942 out of miscl separated units sent to S pacific in early 1942

Of the 17 new divisions shown above 14 were split again in 1942-43 for new divisions. Part of the splitting included the fourth regiment and two brigade HQ removed from the original divisions removed for conversion from 'square'.

26- 45 excepting 39 were National Guard divisions activated from October 1940 through March 1940. 18 total. NG divisions were not split like the others, but did have a portion of their individual cadres bled off to other other units, plus the fourth regiment and two brigade HQ removed for conversion from 'square'

1AD.........1940.................6 AD 2/1942
2AD.........1940.................6 AD 2/1942

3AD.........1941
4AD.........1941.................8 AD 1/1942....Provided cadres for 10AD 7/42, 11AD 8/42, 12AD 9/42, 13AD 10/42, 14AD 11/42, 20AD 3/43
5AD.........1941.................6 AD 1/1942
7AD.........1/1942
16AD.......7/43

The dates shown above are official activation dates. Key personel, the core cadre, were identified by name 4-6 months before the activation date & were sent to appropriate schools for their new job. This was usually one level above their previous job. ie: A major as assistant G3 in the 6th ID would become the primary G3 officer in the 90th ID. Cadres were also bled off from the divisions to form Corps and Army HQ staff.

Anyway, US Army formations sent overseas before November 1942 are liable to have ripple effects on activating and making ready other formations in 1943.

Note: There were two reorganizations of the infantry divisions after the 1940 mobilization. First was conversion from square divisions to a triangular organization based on prewar experimentation. Second occured in 1942 & was based on lessons learned and new equipment available. The second 'lightend' the ID by reducing the over all personnel numbers over 10% while keeping the rifle squad strength intact. This second reorg. in 1942 also delayed readiness of many units.
 
This shows where the ready, and not so ready divisions sent overseas in 1942/43 ended up.

5 ID Iceland..............3/42 Replaced Marine Brigade sent there in 1941

29 ID UK.................11/42

1 ID UK................... 8/42

3 ID Tunisia.............11/42

9 ID Tunisia.............11/42

34 ID UK.................. 1/42

1 Armored UK........... 5/42

2 Armored Tunisia......11/42


Note how of this lot sent to combat in the Pacific 1942 all but the Marines are former NG units

TF 6814 South Pacific 1/42 (AmeriCal Div ) Solomons Sept 1942. Lots of NG units in this TF

41 Infantry South Pacific......3/42 Australia to Dec 42 then New Guniea

27 Infantry Pacific 3/42 Hawaii to Oct 1943, then CentPac

1 Marine South Pacific 3/42 Fiji to Aug 42, then to Solomons

32 Infantry South Pacific 4/42 New Guinea in Sept 1942

37 Infantry South Pacific 5/42 Fiji to April 1943

2 Marine South Pacific 9/42 Solomons

40 Infantry Pacific 8/42 Hawaii to Dec 1943

Also 24 & 25 ID are in Hawaii. the 24th sent to S pacific in Aug 43, the 25th sent to Guadalcanal Dec 42
 
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Just out of curiosity, what about air units? How many planes/people were available to be deployed in this time period and where did they end up historically?
 
Just out of curiosity, what about air units? How many planes/people were available to be deployed in this time period and where did they end up historically?

Very sorry to say I don't have any detail. Short version is the massive expansion kept organization in chaos. As fast as a squadron was trained it was tapped for cadres to stand up new squadrons, or group and wing HQ.

It's research I need to do.
 
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