The armed OH58D can carry which type of machine guns?

The armed OH-58D Kiowa Warrior is primarily equipped to carry .50 caliber (12.7mm) machine guns. This heavy caliber provides an effective range and firepower suitable for the helicopter's reconnaissance and support roles, enabling it to engage both ground and air targets with sufficient stopping power. The .50 cal is versatile for operations involving light armor and personnel, making it a suitable choice for the OH-58D's operational requirements.

Other machine gun calibers, such as 7.62mm or 20mm, may be found in different weapon systems but are not the main armament for this particular helicopter. The 7.62mm is a lighter round typically used in smaller support roles, while the 20mm is often associated with aircraft that require higher firepower for anti-aircraft applications. Thus, the .50 cal is the most appropriate option for the OH-58D's design and combat capabilities.