This document consists of official Japanese Ministry of Defense sole-source contract justifications (随意契約理由書) detailing technical testing and ballistic evaluation for Japanese armor development. The image contains two distinct contract entries justifying single-source procurement under Article 29-3, Paragraph 4 of the Public Accounting Law (会計法第29条の3第4項). Technical calculation support and misfire handling during frontal vital area ballistic resistance tests (正面要部耐弾性試験) for the “New Tank” (Type 10 prototype) at the NOF Corporation (Nippon Oil & Fats) Kamioka Branch. Testing Parameters. Firing 120mm TKG / JM33 APFSDS (Armor-Piercing Fin-Stabilized Discarding Sabot) rounds from a 120mm rig mount gun at target test rigs.Calculating precise propellant charges, firing angles, and ballistic parameters based on manufacturing lots and prior projectile flight paths to hit designated target points at specific impact velocities, as well as handling misfires. Type 10 Armor Evaluation. The lower section explicitly documents live-fire ballistic resistance testing of the Type 10’s frontal armor (正面要部) against 120mm type10/JM33 APFSDS rounds.
This document is an official Japanese Ministry of Defense procurement specification table outlining performance requirements for modular armor and auxiliary systems on the Type 10 main battle tank.
- Gun Mantlet: Main Gun Front | Passive Armor (Special Steel)
- Turret Module Armor: Turret Front | Passive Composite Armor
- Low-Threat Turret Module: Turret Front (Light Config) | Composite Armor
- Hull Module Armor: Hull Front (Upper Glacis) | Passive Composite Armor
- Low-Threat Hull Module: Hull Front (Light Config) | Composite Armor
- Add-on Armor Type I: Turret & Hull Sides | Explosive Reactive Armor (ERA)
- Add-on Armor Type II: Side Skirts | Passive Armor
- Add-on Armor (Top Surface): Turret & Hull Roof | Explosive Reactive Armor (ERA)
- Add-on Armor (Driver Footwell): Lower Front Glacis | Passive Armor
The main armor on the front turret and hull’s key areas withstand 120mm-class tank guns and RPG-29-class HEAT warheads; the lower glacis withstand 120mm and RPG-29 after adding armor packages.
The side No. 1 armor can withstand 12.7mm machine guns, shaped-charge HEAT, and 155mm howitzer shells The roof No. 3 armor can withstand top-attack anti-tank missiles and 155mm
Side armor No. 2 can withstand 30mm armor-piercing rounds and 155mm high-explosive shells.
