What caliber of artillery does the M777A2 utilize?

The M777A2 Howitzer utilizes a caliber of 155mm artillery. This caliber is significant because it allows the M777A2 to fire a variety of munitions, including standard high-explosive projectiles, precision-guided munitions, and rocket-assisted projectiles, all of which contribute to the versatility and effectiveness of this modern artillery system on the battlefield. The 155mm caliber is standard among many field artillery pieces used by NATO forces, allowing for interoperability between different systems. This commonality enhances logistical support and ammunition supply during joint operations.