Ii-20: Inter-Service Rivalry

The competition and sometimes tension between different branches of the military, such as the army, navy, and air force, over resources, priorities, and roles.

Ii-15: Infantry Tactics and Doctrine

The principles and methods employed by infantry units in combat, including formations, fire support, and maneuver, often evolving throughout a war based on experience.

Ii-14: Imperial Japanese Army (IJA)

The ground forces of the Empire of Japan during World War II, known for their disciplined tactics, aggressive offensives, and use of weapons like the Type 99 rifle.

Ii-12: Interdiction and Air Superiority

The strategic objective of gaining control of the airspace over a battlefield, allowing for the disruption of enemy logistics and the protection of friendly forces.