What is the overall designation for a 60mm mortar system?

The overall designation for a 60mm mortar system is M225A1. This designation aligns with the United States Army's nomenclature for mortar systems, and the M225A1 specifically refers to the lightweight, portable 60mm mortar that is often used by infantry units. The mortar allows for a quick response to fire support needs and is designed to be operated by small teams, enhancing the versatility and mobility of ground forces.

The use of the M225A1 reflects its capability to deliver indirect fire, making it effective for engaging various targets without direct line of sight. Other designations mentioned in the choices refer to different types of military equipment or mortar systems that serve different functions within the infantry or other military branches. Thus, the selection of M225A1 is accurate and based on the current military standards and designations for mortar systems.