M101 howitzer
Variants
Variants
--------

Gun variants:
* M1920 – prototype.Hogg – *Allied Artillery of World War Two*, p 42–49\.
* M1925E – prototype.
* T2 – prototype, standardized as M1\.
* M2 (1934\) – minor changes to the chamber to allow the use of fixed ammunition.
* M2A1 (1940\) – modified breech ring.*Technical Manual TM 9\-2005 volume 3, Infantry and Cavalry Accompanying Weapons*.
* M2A2 (1953\) – deeper rifling and shorter rifling taper.
* M2A2E2 (1958\) – prototype with muzzle brake.
* [M3](/wiki/M3_howitzer "M3 howitzer") – lightweight howitzer, with barrel shortened by  with carriage of [M116 howitzer](/wiki/M116_howitzer "M116 howitzer").
* T8 – prototype vehicle\-mounted variant with modified breech and with cylindrical recoil surface, standardized as 105 mm M4 howitzer in September, 1943\.
* FH M1A2 – Rheinmetall\-modified M101 in German service.
* M101 – post\-1961 designation of M2A1 or M2A2 on carriage M2A1\.
* M101A1 – post\-1961 designation of M2A1 or M2A2 on carriage M2A2\.
* M2A1 – modernized L33 variant by [Yugoimport SDPR](/wiki/Yugoimport_SDPR "Yugoimport SDPR") with max range of / (boat tail shell/base bleed shell)
* C3 – Canadian C1 (M2A1\) with lengthened, 33\-caliber barrel
* KM101A1 – South Korean license of M101A1, 1977
* KH178 – South Korean 38 calibers variant, 1983
Carriage variants:
* M1920E – prototype, [split trail](/wiki/Gun_carriage%23Modern_gun_carriages "Gun carriage#Modern gun carriages").
* M1921E – prototype, [box trail](/wiki/Gun_carriage%23Modern_gun_carriages "Gun carriage#Modern gun carriages").
* M1925E – prototype, box trail.
* T2, standardized as M1 – split trail, wooden wheels.
* M1A1 – M1 carriages rebuilt with new wheels, brakes and other parts.
* T3 – prototype.
* T4 – prototype.
* T5, standardized as M2 (1940\) – split trail, steel wheels with pneumatic tires.
* M2A1 – electric brakes removed.*Technical Manual TM 9\-1325, 105 mm Howitzers M2 and M2A1; Carriages M2A1 and M2A2; and Combat Vehicle Mounts M3 and M4*.
* M2A2 – modified shield.
* M2A2E2 – prototype with increased elevation to 70 degrees.
* XM124 \& XM124E1 light auxiliary propelled howitzer – prototype (1962–1965\) – produced by Sundstrand Aviation Corporation, who added an auxiliary drive system for local maneuverability (See also similar [XM123 Medium Auxiliary Propelled 155 mm Howitzer](/wiki/M114_155%C2%A0mm_howitzer%23Carriage_variants "M114 155 mm howitzer#Carriage variants") with similar configuration). The base XM124 provided two , air\-cooled engines, while the XM124E1 provided a single  engine and electric steering.
* M2A2 Terra Star auxiliary propelled howitzer – prototype (1969–1977\) – Lockheed Aircraft Service Company added an auxiliary drive system and a [tri\-star wheel system](/wiki/Tri-star_%28wheel_arrangement%29 "Tri-star (wheel arrangement)") to the carriage of an M2A2 105 mm light howitzer to provide local maneuverability. The last surviving example is at the [Rock Island Arsenal](/wiki/Rock_Island_Arsenal "Rock Island Arsenal") Museum.

File:Canadian C3 howitzer March 3, 2009\.jpg\|Canadian soldiers fire a high explosive round with a C3 howitzer in 2009\.
File:Royal Thai army M101\.jpg\|Royal Thai army M101 with new barrel.
File:XM124E2 Light Auxiliary\-Propelled 105mm Howitzer.jpg\|XM124E2 light auxiliary\-propelled 105 mm howitzer at the \[\[Rock Island Arsenal]] museum
File:M2A2 Terra Star 105mm Auxiliary Propelled Howitzer front quarter.jpg\|The only surviving prototype M2A2 Terra Star auxiliary propelled howitzer at the \[\[Rock Island Arsenal]] Museum. Note the \[\[Tri\-star (wheel arrangement)\|tri\-star wheel system]] and auxiliary drive system on the right trail leg.
File:105mm howitzer in Greenup, KY, US.jpg\|\[\[Greenup, Kentucky]], US
File:21\-24\-151\-howitzer.jpg\|M101 A1 on display at \[\[Patriots Point\|Patriots Point Naval and Maritime Museum]]


How does the M2A2 Terra Star auxiliary propelled howitzer differ from other variants?