Armored Plt (Type 74 MBT x 4)-
7.62mm MG Burst [20 rnds] x 20 should be added to each individual tank
HEAT shells should be removed (it did not receive these shells until the 1980s)
APFSDS-T shells should be changed to APDS-T shells, the ammo count for each individual tank should be increased to 30 (APFSDS was not received until the 1980s as well).
The number of HE shells should be increased to 30 rounds. Considering the only nation to use high explosive for the 105mm L7A3 was France, the HE shells could be renamed HEP (High Explosive Plastic) considering they have the same effects as AP shells anyway.
Sources-
http://www.steelbeasts.com/sbwiki/index ... ition_Data
主砲にはイギリスのロイヤル・オードナンス社の51口径105mmライフル砲L7A1を日本製鋼所がライセンス生産した物を装備しており、105mmライフル砲用の砲弾は当初APDSとHEPを使用していたが、現在ではAPFSDS(93式105mm装弾筒付翼安定徹甲弾)とHEAT-MP(91式105mm多目的対戦車榴弾)を使用している。
The main gun was a 105mm Royal Ordnance L7A3 license built by the Japan Steel Works, and the shells for the main gun was originally APDS and HEP, but now uses Type 93 APFSDS and Type 91 HEAT-MP.
Type 93 and Type 91 refer to the years 1993 and 1991, APFSDS and HEAT were not available until then.
https://ja.wikipedia.org/wiki/74%E5%BC% ... 5%E9%9A%8E
The Type 74 SPH unit should be renamed as follows-
Arty Bty (155mm/39 Type 75 Self-Propelled Howitzer x 6) -- Japan (Army), 1976
It should also have a 12.7mm MG, with 20 x 12.7mm MG Burst [10 rnds].

Sources-
https://ja.wikipedia.org/wiki/75%E5%BC% ... E%E7%A0%B2
https://en.wikipedia.org/wiki/Type_75_1 ... d_howitzer
The Type 74 is a 105mm SPH, while the 155mm one is the Type 75.
Now then, I would like to request three units for Japan (the "weapons" indicates the weapons per mount)-
Mech Inf Plt (JGSDF) -- Japan (Army)
SSM Plt (Type 64 MAT ATGM) -- Japan (Army)
Weapons- 4x Type 64 MAT ATGM
Info-
https://en.wikipedia.org/wiki/Type_64_MAT
Mech Inf Plt (Type 73 APC x 4) -- Japan (Army), 1973

Weapons- 20x 12.7mm MG Burst [10 rnds], 20x 7.62mm MG Burst [20 rnds]
Info-
https://en.wikipedia.org/wiki/Type_73_A ... el_Carrier
Mech Inf Plt (Type 60 APC x 4) -- Japan (Army), 1960

Weapons- 20x 12.7mm MG Burst [10 rnds], 20x 7.62mm MG Burst [20 rnds]
Info- https://en.wikipedia.org/wiki/Type_60_A ... el_Carrier
Arty Bty (105mm/30 Type 74 Self-Propelled Howitzer x 6) -- Japan (Army), 1974

Weapons- 43x 105mm/32 HE, 20x 12.7mm/50 MG Burst [10 rnds]
Info-
車内搭載弾数は43発で、射撃速度は最大で毎分10発に達する。
The ammunition count is 43 rounds, with a fire rate of 10 shots per minute.
https://en.wikipedia.org/wiki/Type_74_1 ... d_howitzer
Arty Plt (Type 75 MLRS) -- Japan (Army), 1975

Weapons- 20x 12.7mm MG Burst [10 rnds], 30x 130mm HE Rocket
Info-
https://en.wikipedia.org/wiki/Type_75_1 ... t_Launcher
Armored Plt (Type 61 MBT x 4) -- Japan (Army), 1962

Weapons- 10x 12.7mm/50 MG Burst [10 rnds], 20x 7.62mm MG Burst [20 rnds], 20x 90mm M36 AP, 20x 90mm M36 HE, 20x 90mm M36 HEAT
Info-
https://en.wikipedia.org/wiki/Type_61_(tank)
Armored Plt (Type 60 ATM x 4) -- Japan (Army), 1965

Weapons- 20x 12.7mm MG Burst [10 rnds], 20x 7.62mm MG Burst [20 rnds], 6 x Type 64 MAT ATGM
This is the Type 60 APC, with no troop carrying space and two Type 64 ATGM launchers attached.
Info-
https://wiki.warthunder.com/index.php?title=Type_60_ATM
For the ATGM- https://en.wikipedia.org/wiki/Type_64_MAT