US OOB 12 very minor comments
 

I would like to list here a few tiny details that I have by chance spotted lately on the US OOB.

1.) Weapon 35 (75mm M1917 FG) has warhead size 5 and HE kill 7. Other 75 mm guns in this OOB have warhead size 4 and HE kill 5.

2.) Weapon 064 (90mm M3 L52) has HE penetration 4. I would expect weapon of this caliber to have HE penetration rating of 2.

3.) Unit 206 (M4A3 (Late) has carry capacity of 12, while other normal M4 Shermans have carry capacity 13.

Re: US OOB 12 very minor comments
 

on the list................

Re: US OOB 12 very minor comments
 

I've noticed a funny thing about M3 medium tanks.

In category Medium tank we have 06 M3A1 from 6/41, 242 M3A3 from 5/42, 243 M3A5 from 7/43 - while there is no basic model M3, which was most numerous (some 900+, after sending some 4000 M3 to lend-lease), and apparently the only one actually used in combat by the US troops (in the Torch, Tunisia and Makin atoll in 11/43 - books refer to them only as "M3").

There is no clear info in Hunnicutt's book, but apparently M3 started to be given to the Army from 8/41 onwards. M3A1 entered production in 2/42 only, and only 300 were produced. Diesel M3A3 entered production in 1/42 (322 produced), and basically the same M3A5 in a course of 1942 (591 produced, part lend-leased).

Later production tanks (from around mid-1942?) had longer 75mm M3 gun, so it can be doubled with this gun.

So, I suggest to leave M3A1 with corrected dates (interesting variant with cast hull - a photo is correct), and change the remaining two to M3 (M2 and M3 gun), both available until 4/44, when M3 were declared obsolete. Or they could end in 11/43 (Makin Atoll). Photos are probably OK - there was no difference in front view. Actually, they are probably M3.

Same for category CS tank with 244 M3A1, 256 M3A5, 258 M3A1

Re: US OOB 12 very minor comments
 

134 1&1/2 Ton Truck - if this is supposed to be AT/wheel infantry carrier, then I guess it's batter to change the photo to otherwise ubiquitous 1&1/2 Ton Dodge WC-62 (eg. 00405)

Re: US OOB 12 very minor comments
 

145, 153, 214 - 75mm Pack How - I believe, that icon 2111 is better - it had no shield, and relatively shorter barrel and longer tail (a drawing here http://www.ww2gyrene.org/weapons_pack_howitzer_75mm.htm ).

Until around 1940/41 they were used with wooden wheels - maybe it's worth to split unit 153 to two units, the earlier one with ready 8624 picture.
Unfortunately, publications don't tell when exactly M8 gunbed with rubber wheels was adopted - "large-scale manufacture of the M1A1 pack howitzer did not resume until September 1940", possibly on M8 gunbed (Osprey New Vanguard 131 - US Field Artillery of WWII)

As for unit 44 75mm Howitzer, it might be just pack howitzer (same comments as above) or very rare 75mm Field Howitzer manufactured for cavalry, with the same M1A1 gun, but twin-tail M3 series bed. However, "no significant production" took place until the war, and serial production started in 1/41, and only 349 were made, "nearly a third provided to China", as the cavalry lost interest in towed guns.

Same for USMC OOB: 30 75mm Howitzer, 123,124,125,145,146 - 75mm Pack Hwtzr.
Between 123 and 124, in 1938-41 there could be another unit added, with wooden wheels and weapon #33 M1A1. Unit 123 also should have weapon #33, not #150 M8.

BTW: I don't know why (newer) weapon 150 M8 FH in USMC OOB has lower range 164, than 33 M1A1 FH - both were in fact the same gun with M1A1 barrel and 45 deg elevation, and 8.9km range according to Osprey (178 of weapon 33 is correct)... in fact M1A1 could be used for all.
Similar situation is with US OOB - weapon 150 is M1, with shorter range. Differences between M1 and M1A1 guns were rather minor - unfortunately, there is no info, when the model was changed (before the war).

Re: US OOB 12 very minor comments
 

11, 314 M4 3-4-3 Flame - for most of its service it was known as M4 E4-5 Flame - only from 4/45 a derivate of an auxiliary flamethrower E4-5 was standardized as M3-4-4 (Zaloga: "..many unit records refer to the various types of auxiliary flamethrowers under the generic E4-5 designation...")

Both units differ in number of FT shots 1 or 3, but this is hopelessly low, while USMC #205 M4 E4-5 Flame has 10 shots.
In fact it had 50 gallons and a burst time 50 sec (a comparison is here http://forum.shrapnelgames.com/showthread.php?t=50474 ). Early ones might have been an early variant with 25 gals and 40 sec.

A Crocodile (#315) had 400 gals and 80 sec.

Also, same machines as USMC OOB #100 M3A1 Flame, with improvised infantry flamethrowers, were used in action by the US Army on Pacific theatre from 1/44.

Re: US OOB 12 very minor comments
 

028 M8 Greyhound could never carry that much ammo (32 HE, 80 AP). According to Osprey NV 053 M8 Greyhound, a factory stowage was 80 rounds. In fact, cavalry cars had two radios in a hull, what caused a reduction of ammo to sole 16 rounds in a turret. Such cars were manufactured from 3/44 (or maybe even modified from 11/43, when two radios were authorized?). After applying different field modifications (eg. 16+36 rounds), a field modification with 79 rounds was accepted in July 44 (43+20+16). Cars from tank destroyer units had original 80 rounds.
BTW, the gun was M6.

Re: US OOB 12 very minor comments
 

A better picture is 30243, since it was bow-mounted flamethrower, while current one shows a FT mounted in a turret (POA-CWS-H1)

M4 POA-CWS-H1 with turret-mounted FT could be also added to the Army (copied from USMC unit 203, with changed name to M4) - they were used by the Army on Pacific theatre (54 tanks available from 1/45, used from 4/45 on Okinawa).

#312 M42B3 - personally I couldn't find such designation... apparently it's M4 POA-CWS-H5 with HVSS suspension?

BTW: #720 LVT(A) 4 - maybe it's worth to replace picture 09386 with beautiful 2470, with prominent Army star (avoided by the Marines)

Re: US OOB 12 very minor comments
 

I went through my files and found a document I photographed in US National Archives II in College Park, MD titled SPECIAL FULL TRACK ARMORED VEHICLES.

The M42 was an official designation used for standardized main armament flamethrower tanks; and there were two variants produced:

M42B1: Rebuilt tanks using M4A1 tanks as a basis.
M42B3: Rebuilt tanks using M4A3 tanks as a basis.

Both variants used the M5-4 / (E12-7R1) flamethrower with 315 gallons of fuel; replacing the main armament.

Several HUNDRED of these were remanufacturered by August 1945; with HUNDREDS more cancelled by the end of WW2 in August 1945.

Re: US OOB 12 very minor comments
 

Photographs of interest. It doesn't say which version is shown; but true Sherman aficionados can figure out which is which by looking at the hull.